Too late to change trainer now. I agree with the hammer that his style changed for the Kostya fight and he never got back, but it's possible he stuck with the hug and hold since he can't maintaIn the same stamina as in his youth. It's impossible to say for sure from the snippets of traing we see but it does seem that Hatton is the boss during the sessions nowadays, perhaps not following Graham's lead, but it could all be just clowning around when the cameras are on.