We've seen Walcott above 200 lbs and we've seen Bird below 200 lbs. Different training and diet, it doesn't make Byrd bigger though.
I don't see anyone writing books or making YouTube videos breaking down and analyzing Takam or Huck either. They simply aren't that special and they're two of Povetkin's best wins. Both fight were highly competitive affairs and they're around Louis size.
Because I can see it. I'm not saying he has none of either, but it's clear that he's put most of his emphasis on developing his offense. As previously pointed out, Galento not only was able to swarm Louis but also clout him upside the head quite a few times.
I'd agree that Takam was overweight if he gassed because of his big muscles, but he is noted for having a particularly good stamina
If a guy is 6'1 and 250 lbs of solid muscle yet doesn't gas at all, there's a very good possibility he is taking peds. It is very rare someone can reach that weight at that height without being a very dedicated body builder.