They could have hired Joe Schmo is my point. Joe Torre, for example, isn't a great manager because he knew when to bunt or when to turn it over to the best relief pitcher to ever do it, he's a great manager because he helped keep one of the greatest rosters ever constructed from wanting to beat the shit out of each other on a daily basis.
I'd also go on record saying moving A-rod to leave Jeter at short is one of the worst tactical decisions ever made, but from a team continuity and chemistry standpoint, which is what I'm arguing is a managers real job, makes sense.