Archie Moore fought until his 50s with it and had over 200 fights and had no brain damage and was still well spoken until his 80's.
Ken Norton beat Ali officially once and arguable won the other fights against him as well, he also gave Holmes hell and arguably beat him. He was one of the most underrated heavyweights of his ear using the cross guard.
George Foreman became the oldest fighter to win the heavyweight title in his 40s using the cross guard. He also has no noticeable brain damage.
Tim Witherspoon only had 15 fights and gave Holmes hell and nearly beat him using the cross guard against him.
Ken Norton beat Ali officially once and arguable won the other fights against him as well, he also gave Holmes hell and arguably beat him. He was one of the most underrated heavyweights of his ear using the cross guard.
George Foreman became the oldest fighter to win the heavyweight title in his 40s using the cross guard. He also has no noticeable brain damage.
Tim Witherspoon only had 15 fights and gave Holmes hell and nearly beat him using the cross guard against him.