As far as how good Miller's chin is, there's video of Miller taking a few hook kicks to the head from Mirko Crocop in a kickboxing match. The one in the last round was pretty nasty and knocked Miller back but he recovered and fought on.
I wanna see him fight breazeale.. before he gets a shot at Joshua or wilder to be honest. getting a world title shot without beating someone like a chisora,whyte,parker,pulev,fury,takam,breazeale, povetkin Is a joke... you should need a win atleast vs 1 of those guys I listed to earn a title shot of any kind..
He's generally getting underestimated here, I think. He would pose problems for anyone. Right now I d pick AJ, fury, Wilder, Ortiz and Sasha over him. Whyte, Pulev and Parker would have a chance. But I wouldn't be totally shocked if he actually wound up being better than most of those guys after all.
I don't find him likeable at all. Wilder, Breazeale and Miller all come across as phonies with all their talk.
His size is a problem for a lot of heavyweights. I can't imagine Usyk being in there with such a big man and have an easy time. Fury would have no problems, but smaller guys will have to find a way to keep him off.