The manager does not have to be a PhD (in fact, not really desirable). The manager has that job of connecting the information to the stuff on field. Also, I think in a lot of front offices, managers are shifting the way of NFL head coaches - managing your staff of coaches is at least as big a gig as the stuff we see on TV. Francona has been really good at connecting all of those various views - relating to players, developing his coaches, working the media and implementing the front office's baseball philosophy.
Actually typing this down, you notice that Bobby V did 0 of those things. Farrell so far has been solid at them.