They got rid of him because Banks is cheaper, ultimately. I'm not sure it's made much difference either way really. Sanchez's corner instructions between rounds weren't any good either
I don't think this is a trainer issue. It's a combination of age/opponent/physical ability. Golovkin simply can't perform at the level he was previously performing at.
GGG should hire Freddie Roach and Fat-Buboy. Evidently, They know how to train a 41 Years old to fight young, turn the clock back and win
Sanchez wasn`t even present in the gym while being Ruiz`s trainer for his bout v Parker and GGG kept backing up in a straight line v Canelo without countering, now he counters better and doesn`t get caught moving back while staying on the center line.