I think there's a lot of speculating there. I have little doubt he'd be a good mentor, but the rest is a big question mark. Two of the last three years he's had an OPS under .600. Rest doesn't cure age and a career's worth of stints on the DL.
This goes to prove that it is a team game, made up of individuals. When no one is playing well enough to make up for the ones who aren't, teams lose games. The Orioles experienced a team slump that with a couple of hot hitters might have been turned around. Hitting is contagious, not hitting may be the same