Curtis Stevens is a monster puncher and he couldn't even phase GGG when he hit him flush. David Lemmings is just an above average puncher, and he has a glass jaw. Both hits each other with maximum force at the same time....guess who will be smiling after the punch and who will be on the canvas writhing... :rofl
Lemieux is a bigger puncher than Stevens plus he is more skilled. Still GGG is above Lemieux at this point and by a lot!
Curtis Stevens was supposed to have big power too. If you're a massively inferior boxer, it doesnt matter that much, how much power you have. If Marco Antonio Rubio can beat you up and Joachim Alcine can outbox you, GGG is going to end your career.
Based on what? Lemieux has knocked out nothing but bums and couldn't even make a dent in the two opponents that beat him easy. Curtis Stevens has knocked out light heavyweights during his time at that weight division and brought his power back to middleweight. Stevens is the obvious harder puncher of the two, bar none.