The hands are getting ahead of the body because they are missing sequence, posture, etc. The hands stay back in the entire swig process because he's in proper sequence. The drill helped CY because it taught how to strike the ball with very little waste(loop) in his swing, it taught him how to hammer the ball, drive the ball etc. It was efficient, his bat path created back spin.. it eliminated the hooks, top spin, the roll overs... resulted in line drives with back spin.
Who said loops are bad?
One of the first guys I studied was Dave Hudgens, he was teaching the same thing your saying back then.
So, I’ll ask you one question. How short is too short?