Nelson broke people down he did lay people out with one shot like Naz did. You clearly don't know boxing by what your saying. Took him 8 rounds to stop Fenech after he went 12 rounds with him in the first fight and didn't hurt him at all. And Fenech came up from 118 to fight Nelson at 130. Cowdell??? 7 months after Nelson KO'd him in the first he was KO'd in the first by Najib Daho who was 29-18-1 with only 7 KO's at the time. Gomez got stopped after an 11 round beating. And Gomez was never the same at 126 that he was at 122.
punches seems hard when you don't see it, it even knocks you down...not putting down Naz, he has above average power but it has something to do with his style that makes it look more powerful. Even when he gets hit.. you think that he was hit hard because of the way he tries to avoid the punch..but actually he just swayed with the punch.
P4P, Hamed hit much harder than Tyson. He had one-punch K.O power at a very low weight. He's up there with the Julian Jacksons.
Yeah, it's not like the most famous boxer of all-time ever did that. Or Roy Jones, on occasion. Heck, even Floyd. They all did it better, too.