You do find good talent embedded in poorly performing teams, but that doesn't last very long (few years at most). People like to be around others with similar standards. Good talent will gravitate to teams with high quality talent and conversely good teams tend to pick good quality people. It's a form of sorting that over time results in people with similar standards working with one another.
Because in my experience the people that do the heavy lifting are just randomly distributed and are bright spots in a otherwise gray landscape.