Nah, Zab had the same mental weaknesses Tyson had. It wasn’t their skills.Holyfield was head butting the shyt out of Mike that fight. That's why Mike bit him. Otherwise I don't know if it was a mental in so much as a lack of elite boxing skill.
Mike was an athletic mauler and decent boxer but he had one gear and didn't have the tools to switch up if he couldn't beat you to death.
Alot of New York fighters were like that. Physical specimens but rarely could implement a plan B or C. Take Zab for instance .