It would be hard for any fighter to be gamer than Frazier.
He basically committed suicide when he faced Foremen the first time, and put that kind of relentless pressure on a devastating puncher like that ... although it looked like he almost turned and tried to jump for a split second there after like his 5th knockdown (was hard to tell if he had his faculties or not).
On the second fight, Frazier tried to be cute (turned boxer) ... he had enough of pressure-fighting Foremen ... and, though he gave a good effort and made it to Round 5, when he got floored again and Foreman started finding him, he sure wasn't protesting that stoppage
Jack