<But as said, wingspan alone is no solid guide.> Huh? It's a guide to what somebody's reach is, which is the point of the thread. Lewis is about 82" imo (I do not take most sources of 'stats' seriously.) Another guy with a huge wingspan is Rahman, 6'2" and about 82"
Sources disagree considerably on Carnera's measurements but many tale of the tapes in newspaper articles say his reach was only 80 1/4 inches.