One time winners don't project that sense of alpha male pack dominance that the multiple winners project.
Even Zane, who won three consecutive titles, had to fight, so to speak, to win each of his titles. From what I hear and read from people who were there in the 70s, it seems that nobody was ever sure that Zane would be able to back up and defend his title. The Arnold, Haney, Yates etc years seem to be the opposite.
Interestingly enough, there were different winners each year from 1979 1984. Obviously during those times, bodybuilding was looking for its alpha male leader. Is it right to say then, that those years were the most competitive, at least in terms of the competitors having a reasonable chance of believing that they could win the title?