The problem with this is Wilder has fought into the later rounds several times and won. What's more it's not like we have any reason to question Wilder condition. We can question his boxing ability and technique but I don't question Wilder condition so I have no reason to believe he will fade late in fights. So far that hasn't happened. When it come to Wilder it seems most people look at his flaws without looking at his strengths. And yes he has several flaws. The thing is most people don't scrutinize other fighters weakness as close. So it hard for most people to accurately assess Wilder when compared to other fighters. I just don't see Breazeale or Whyte beating Wilder. The difference in athleticism is just too great. And their strengths don't make up the difference imo. Some may argue that Breazeale or Whyte are better technical boxers. I don't see any of the three as great technical boxers. And even if Breazeale or Whyte are better technical boxers the problem is Wilder has already destroyed several guys that are better technical boxers than him. Floyd Mayweather is a better technical boxer than every single heavyweight yet he isn't beating any of them. At some point size, strength and athleticism matters.