I really dont rate booth as a trainer what so ever. The only reason haye got to where he was is because of his huge punching power and natural athleticism. Both Haye and groves have TERRIBLE defence and balence, basic stuff pro fighters should have.
Since then booth has added Andy lee and selchuk aldyin to his rooster and both looked poor since being with him.
The only plus to booth is his tactical thinking. Ie, the way Groves came out and stuck behind the jab against Degale for the win. Even then it was razor thin and some people think chunky should have won.