Tyson- was he ultimately too small for a HW?

Rooney and Cus were specialists at training that perfect style suited for shorter quicker heavyweights. Similar to how Steward is a specialist at training tall heavies. Tyson when focused and training with the Cus/Rooney style was able to get inside tall guys easily with quickness, head movement, and angles.

Later in his post Rooney career Tyson hardly used any of that.. Which has a lot to do with how things went down.