I'm going to disagree here. I think coaching is probably one of the more unrecognized talents in baseball, and I suspect that this is going to get a lot more scrutiny as the money ball people realize there's an inefficiency here. I don't think it's all coaching, but I do think there's a healthy balance between talent and coaching, and it's an extremely difficult task to quantify. I also think that coaches and their approach can be too narrow and get stale, and as such, a coach can have a tremendous amount of success early on only to see that evaporate. As a team, I see value in bringing in different folks to assist with that. I think that is in part of the reason why several players have turned around offensively as Bruno was a better fit for these guys than Vavra, but that doesn't mean that Vavra was worthless. He also had success early on. Baseball is all about adjustments. Here's an example of one good one: Danny Santana. Everyone says he's not going to continue hitting this well, and I'm inclined to agree. It isn't as much that he's getting lucky as it is that there's not much data on him. As that data becomes more complete, pitchers are going to adjust to exploit his weaknesses. When that happens, he's going to get into a bit of a slump. SABR people will say he's regressing to the mean, but this has nothing to do with luck and everything to do with smart people exploiting his weakness. This is where his coach is going to come into play. The coach will have to help him adjust. Santana could possibly do this on his own, but a good coach should be able to look a bit more objectively at what Santana is and isn't doing well and help him adjust. That may be mechanical, teaching him how to better spot that pitch to not swing at, or something else altogether. Bottom line though is that a good coach will help him with things like approach and in game strategy. His talent does the rest. If he has the talent to be an all star (like Hughes), a good coach will coax that out of him... I agree though that there's more to it than this such as personalities, media, etc. Bottom line though, to me, coaching matters, and I don't think it's a job that anyone can do. I don't see them coming up with WAR values for managers and coaches, but I do think that a good staff is worth a few wins over a bad one. It's unfortunately impossible to quantify.