The Distributed Leadership Substrate

The first precision required is definitional. Leadership is not a social role, a personality trait, or a cultural construction. It is the mechanism by which a group or organism coordinates energy expenditure to resist entropy and ensure reproduction and progression. Cohen (2020) and Ouko (2025) both confirm that evolution selects for traits that improve entropy management — and leadership is the group-level expression of that selection. A group without a coordinating mechanism dissipates energy randomly and fails to reproduce. A group with an effective coordinating mechanism concentrates energy, reduces waste, and increases the probability of survival across generations.

Because leadership is a thermodynamic function rather than a social role, it cannot be monopolised by one sex without cost to the group's entropy-resistance capacity. The research confirms this: in spotted hyenas, high-ranking females lead collective movements, conflict resolution, and intergroup encounters. In killer whales, post-menopausal females lead their groups to scarce resources, increasing the fitness of their sons (Brent et al., 2015). In recently settled hunter-gatherer societies in Ethiopia, gender is a weak predictor of leadership once other factors are controlled for — the traits that predict leadership in men and women are the same (Garfield and Hagen, 2020).

The distribution is not equal in all contexts — the research is clear that the cost-benefit ratio of leading differs by sex depending on the specific challenge being faced. But the capacity is present in both, and the substrate is hormonal in both. What varies is which hormonal configuration is activated, at which phase of the cycle, in which environmental context.

The word "cycle" is precisely correct, as Johan identified. Hormonal leadership expression operates on four distinct temporal scales simultaneously, each with its own leadership implications. The word "period" is also valid — each scale has a period, a frequency, and an amplitude that varies with environmental conditions.

A critical bidirectional finding from PNAS (2015) adds precision: wielding power increases testosterone in women, regardless of whether the leadership is expressed in stereotypically masculine or feminine ways. The cycle is not only hormones producing leadership readiness — leadership behaviour itself produces hormonal changes that reinforce and extend the leadership configuration. This is the forging mechanism (Part XXX) operating at the hormonal level: the act of leading is itself a forging pressure that reshapes the internal force field.

The bidirectional forging loop between leadership and hormones explains the social function of leadership and the origin of earned authority. A leader who acts — who coordinates energy, reduces entropy, and increases the group's probability of survival — receives confirmation from the audience. That confirmation is not merely social approval. It is a measurable hormonal signal: the leader's testosterone rises in response to successful leadership, and the followers' cortisol decreases in response to effective coordination. The group's entropy resistance improves. The leader grows in the role.

This is the precise mechanism that distinguishes earned authority from claimed authority. Claimed authority is imposed by force, inheritance, or institutional position — it does not require the audience confirmation loop and does not produce the bidirectional hormonal reinforcement. Earned authority is the product of repeated successful coordination: the leader acts, the group benefits, the confirmation signal returns, the leader's hormonal configuration is reinforced, and the capacity to lead grows. Over time, the earned leader develops a hormonal profile that is measurably different from the claimed leader — higher baseline testosterone, lower cortisol reactivity, greater tolerance for the forging pressure of leadership responsibility.

The research confirms this mechanism. Cortisol and testosterone in leadership practice (MDPI, 2021) found that dominance in a leadership context is not associated with high testosterone concentrations per se, but that testosterone primarily mediates the response to successful coordination — the earned authority signal. Basal testosterone associates with acquiring leadership positions, not merely holding them. The acquisition is the forging event.

This is a structurally coherent and empirically supportable thesis. The argument proceeds in four stages, each confirmed by existing research:

Johan's observation that both sexes transition hormonally toward androgyny in the second arc — sharing ownership in the grandparent role — is the most precise available description of what the research confirms as the post-reproductive hormonal convergence.

In the male second arc (Part XXXII), DHT-mediated external formation declines and testosterone is redistributed toward depth, transmission, and relational authority. The male hormonal profile moves toward a higher oestrogen-to-testosterone ratio — not because testosterone declines absolutely, but because the DHT amplification that made the first arc's configuration so strongly masculine is no longer active. The result is a hormonal profile that is measurably more androgynous: retaining testosterone's drive and assertiveness while gaining oestrogen's relational sensitivity and long-term perspective.

In the female second arc (Part XXXIII), oestrogen declines and the adrenal androgen substrate (DHEA, androstenedione) becomes relatively more prominent. The post-menopausal female's hormonal profile moves toward a higher androgen-to-oestrogen ratio — not because she becomes masculine, but because the oestrogen dominance that made the first arc's configuration so strongly feminine is no longer active. The result is a hormonal profile that is measurably more androgynous: retaining oestrogen's relational wisdom while gaining androgens' assertiveness and boundary-setting capacity.

Both arcs converge on the same hormonal territory from opposite directions. This is not a coincidence. It is the evolutionary design of the grandparent role: the shared maintenance of the third generation requires a leadership configuration that combines the best of both first-arc configurations — the female's relational coordination and the male's resource orientation — in a single individual. The grandmother hypothesis (Hawkes et al., 1998) confirms the fitness value of this configuration: post-menopausal women who invest in grandchildren significantly increase the survival probability of those grandchildren. The grandfather equivalent — older males whose testosterone redistribution enables patient mentorship and knowledge transmission — is less studied but equally present in the ethnographic record.

The androgynous convergence is the evolutionary answer to the question of what leadership looks like when reproduction is no longer the primary function. It is leadership in its purest thermodynamic form: the coordination of energy for the benefit of the group, without the hormonal asymmetry that made the first arc's configurations so strongly sex-differentiated. The grandparent is the most complete expression of the distributed leadership substrate — carrying both configurations, no longer dominated by either.

The final component of Johan's observation — that the hormonal leadership cycles are environment-sensitive and DNA-sensitive, explaining adaptation to environmental change — is confirmed at both the molecular and population levels.

At the molecular level, Zhang (2011) established that hormone levels vary in response to internal and external environmental changes, and that steroid hormones including testosterone and oestrogen directly shape DNA methylation patterns — the epigenetic layer that sits between the genome and its expression. This means the environment writes itself into the hormonal system, and those changes can be transmitted to offspring through epigenetic inheritance. The leadership capacity of the next generation is shaped not only by the genes they inherit but by the environmental conditions their parents and grandparents experienced — encoded in the methylation patterns of the hormonal receptor genes.

At the population level, Smith et al. (2021) confirm that sex differences in leadership expression are moderated by socioecological variation across development. The same biological substrate produces different leadership distributions depending on ecological, social, and cultural conditions. In matrilineal societies, female leadership is more prominent. In high-resource environments with reduced inter-group conflict, the male resource-defence configuration is less dominant. In environments where offspring survival is threatened, female competitive leadership increases — women become as competitive as men when competition directly benefits their children (Cassar et al., 2016).

This is the adaptive mechanism Johan identified: the hormonal leadership cycles are tuned to environmental conditions, and that tuning is heritable. A population that has lived for generations in a high-conflict environment will have a different hormonal leadership profile from one that has lived in a cooperative, resource-rich environment — not because their genes are different, but because the epigenetic expression of those genes has been shaped by the accumulated environmental experience of their ancestors. Leadership adapts to the environment not in real time, but across generations — through the epigenetic inheritance of hormonal sensitivity.

Academic References