Dogrock, I think that you have to look at how you are using the word "weakest," and the assumptions that you are drawing from that usage.

Humans, as do some animals, can become alpha through brute force or political means. Your example of the physically weakest wolf becoming dominant does not contradict the concept of alpha leadership, as the wolf's smarts and self-awareness have allowed it to become alpha.

Apart from some exceptions through lineage and succession, which allows family and political successors to stand on the shoulders of their alpha relations and leaders, becoming alpha is a conflict between competing interests.