In both the elephant and orangutan examples, this dichotomy might be because resident males have already built a social structure that works. The value of anoth

In both the elephant and orangutan examples, this dichotomy might be because resident males have already built a social structure that works. The value of another male alpha male might be redundant. If that is the case, the younger male physiologically self regulates because the destruction of a new alpha male isn't worth the marginal benefits. In other species this is not the case and constant fighting to be the alpha male is worth it in aggregate.