How important is a great trainer for great fighters?

I think a guy needs a great trainer for them, every trainer is not for every fighter and that relationship is key to getting the best out of a fighter.

I think trainer should be more then just a guy who is holding pads like finding the right sparring partners and understanding the fighters mood and etc... if a coach is able to do that then yes he is worth it. If all a coach does is hold a pad and yells and screams at ya then he needs to go the fawk home!!!!