Toronto had Carlos Tosca managed the team in 2003 and 2004. They played better than many expected in 2003, but in 2004 everyone gor injured and they fired him.
Tosca had been a coach for years, actually, but he never played pro ball. That fact, apparently, was a HUGE deal to his players, and bubbled up big time the moment the team faced some adversity.
Logically it should matter very little. You really do not need to be an ex-player to know how to assemble a lineup. I don’t think it takes a huge genius to conclude that Mike Trout should probably play every day and hit near the top of the lineup, or that Felix Hernandez can safety be deployed out there every fifth start. In terms of the physical coaching details, that is why you have pitching, hitting, bullpen and base coaches of all sorts.
But leadership’s also emotional, and to pro athletes the knowledge that a guy faced the same struggles they do is a really big deal. Even if the guy was a minor league scrub, that’s fine; after all, it’s the fringe players and the scrubs and the maybe-they’ll-make-it prospects who need most of the finessing, if you will, so a manager who’s been there can relate. It’s going to be very hard for Jennings to sit down with a guy who’s being sent to the minors to work out a flaw in his swing and say “I know how you feel” because he doesn’t know, and you can rest well assured the player will know damn well he doesn’t and it will probably have been mentioned a LOT in the clubhouse.
So Jennings can convince himself all he wants that he knows how to fill out a lineup card, manage a bullpen, and know when to bunt, and you know what? I bet he can. But shit, I know that stuff too. Come on, it’s really not rocket science, and most teams are tactically managed pretty much the same way. I could run an MLB club, tactically speaking, about as well as most managers. So could a lot of people in this thread. The fact remains, though, that I would not have a one in a trillion shot of succeeding because I would not be capable of managing the personnel. I just don’t know how to do that because I have spent no time in a professional baseball clubhouse, learning the political and personal idiosynchratic details of it. Nobody involved would respect me and the team would dissolve into infighting and argument.