i think your missing a point, being a best boxer not only consider whom did you beat even if that is one of the criteria, mike tyson is considered the best because his body itself was against him as he had short reach( short fore limb), he was short interms of height, he had small body, so he was ouclassing a boxer with longer reach, tall, powerful than him etc lennox lewis had everyting, good reach, height, power, body weight, tall etc so he had plenty to aid him in fight so it was like almost automatic he will win a contest! tyson uses speed, great agility, movement, escape puches and even hit the guy with longer reach by excelent timing that what makes tyson better than lewis!