"What we do know is that if Parker is going to be the one to do it, he'll have to be a lot better than he has appeared over this last three fights," McCarson writes.
"In 36 rounds against H. Fury, Razvan Conjanu and Andy Ruiz, Parker has done exactly nothing to separate himself from the pack."
McCarson says Parker's feel are too slow and he doesn't have the power.
"If anything, he has displayed all the reasons he's not going to end up being a heavyweight worth remembering. He doesn't know how to land power punches. His feet are heavy and slow, and he can't cut off a ring to save his life.
"The Parker who defeated H. Fury isn't the type of fighter who should be paraded around the world as a champion. That fallacy is simply a byproduct of boxing's alphabet belt overload. It might be better just to reference the Transnational Boxing Rankings Board's heavyweight snapshot.
"Who is the real heavyweight champion? That's easy. There isn't one," McCarson says.