Astute point. Similarly in pools of high level athletes you can't find correlations between sports success and certain traits that are well understood to promot

Astute point. Similarly in pools of high level athletes you can't find correlations between sports success and certain traits that are well understood to promote performance. It would be too expensive to maintain many generations of giraffes with less sexual selection pressure to breed the equivalent of couch potato average Joes to test, but that's what model organisms are for.