Joe Louis perhaps?? Jack Johnson? Jim Corbett maybe base off of the Fitz fight and other highlights in training. Gene Tunney has a top jab. Ezzard Charles and Joe Walcott?? Larry Holmes of couse, and Ali. Dempsey when he wanted too of couse.
And this is also something that Jack Johnson was noted for. Whenever Buster went to his toes, that could spell big trouble for an opponent. He'd use that movement to generate greater plyometric force and better angles behind his jab and other punches.