no.. at this stage of his career its better for him to stick with the man who knows him best. he doesnt have that many fights left in him so trying to change too much would most likely have more of a negative effect imo.
he needs to change his approach a bit, there are certainly things he needs to improve but it think roach can teach him or atleast push him in the right direction. trying to go in a whole other direction might make him lose what made him so good in the first place.
a few years ago i would have said yes, but right now just stick with roach. i dont think manny has more than a year or two left in boxing anyways.