I share that concern about Valendia. He's never managed at any level. Calloway was at least a college head coach at one point. As for pitching coaches who became successful managers, yeah, they are few and far between. I was thinking Larry Dierker was one but while he was a pitcher, he was never a pitching coach.
Just wondering, is there any limit to the number of coaches a staff can have? I remember growing up when it used to be just bench coach/backup manager, pitching coach, first base coach who was also usually hitting coach, third base coach and bullpen coach. Now, the first base coach specializes in baserunning, we have multiple pitching coaches, multiple hitting coaches, a catching coach and sometimes multiple bench coaches. The Dodgers have a "quality assurance coach". Could that be a position Valendia slides into if he doesn't get the job?