foreman simply kept pounding away with wide swinging arm punches against ali, punches that ali simply put himself in position to let the loosened ropes take a lot of the force.
foreman was so sure he break through that he just kept pounding away exactly the same way over and over. he didn't throw a single uppercut or combination.
frazier, on the other hand, was significantly shorter than foreman and was able to give ali fits. difference is that tyson is not going to just walk straight in bobbing up and down like joe, he's going to come in bobbing and weaving, lateral movement, slipping the jab left and right and dropping bombs in combos with pin point accuracy. ropes won't help ali when tyson throws those devastating uppercuts and hooks in close.
tyson = more power, defence, arsenal and speed than frazier and arguably a better chin.
tyson = far more speed foot, hand, better accuracy, defence, ring savvy than george