While Lewis' chin is questionable, I think it's highly underrated. Dude was looking out of shape vs Klitschko, took some bombs (watch round 2) and never dropped.
I don't think Lewis was ever in his physical prime with Manny Steward though, if anything maybe the tail end of it. However, dude was much more cerebral under Manny,
I just think when focused, dude's defense, reach, height, and power is a real tough match-up for any heavyweight through the generations. That jab alone makes a case for goat for the category. Throwing that punch from his hip and making big Heavyweights fall back
.
Lewis literally had HW's in the late 90's to mid 2000's hoping he'd lose or retire so they could get the title w/o having to go through him.