He isn't the p4p puncher that Hamed was, obviously, but the way the land their punches and their general styles are fairly similar. Coincidentally, I think another one of Ingle's students, Herol Graham, is one of the closer stylistic counterparts of Silva in boxing (several other slick southpaws like Nunn or Byrd also bear some resemblance, or perhaps it's more correct to say that Silva bears some resemblance to them in terms of style). No one in boxing questions whether Hamed or Graham had very heavy hands, or chalked up their KO ratios primarily to exceptional timing and accuracy (though, again, that's obviously part of being a good puncher). It was commonly accepted. Saying that others hit harder is great and all, but it doesn't change the fact that he is blessed with extremely heavy hands. It's akin to saying the Ernie Shavers hit harder than Joe Louis. He likely had more raw power, but Joe was blessed with a tremendous amount of raw power, as well (in addition to great timing, hand speed and accuracy).