I've always been a big believer that playing ability has little to do with coaching ability. For example, Ted Williams was a great play and a bad coach. The same was true with Rod Carew. Even Tony Gwynn is proving to be a below-average coach in college baseball.
Rudy Jaramillo was never a big-time hitter. Clint Hurdle, who I like and is a solid manager, has already proven that he can coach. Charlie Manuel, who is well-known as one of the best hitting minds in the game, was a career .198 hitter in the Majors.