Had Chuck been a boxer he would have merely had to concentrate on his hands. He certainly would have been a more calculating striker due to that focus and the experience he would amass rising through the ranks.

However, as a Cruiserweight in boxing he would have been undersized.
Additionally he doesn't have the best body for movement so he would have been exploited by many fighters, bigger/quicker/more skillfull.

However, in boxing he would have been marketed carefully and made a truckload more money"!