Tunney. What Leonard taught him to use to thwart Greb's assault. Tunney is a great, great fighter and one of histories greatest Heavyweight Champions.
Seeing Tunney v Gibbons and the way he went to the body was eye opening for me, and then to read accounts of his pre Dempsey fights...very different than the fancy Dan style boxer of the common perception.
This one is even tougher than the jab. Both were amazing at body punching. Maybe someone who knows more will share his/her opinion here
Tunney is very underrated for body punching imo. From descriptions and some film it seemed he had a brilliant punch to the heart.