Holyfield might have been the best HW ever if he was 6' 5" and weighed about 240 lbs.

He is still a great HW who was able to hang with & beat the best behemoths, but his lack of size was his undoing against Bowe & probably against Lewis.

If he was the same size as those guys with exactly the same attributes, but with the increased physical strength that comes with being larger, I don't think those guys would have beaten him.