Cruiser at 200, or the old 190? Some guys could possibly have melted down to 200, but not quite 190. I could see Iron Mike weighing in at 200, but not any less. Byrd just fought a chump at cruiser, if he tried when he was younger he might have done well. Calvin Brock, Eddie Chambers could have been cruisers. If you go back to before there was cruiser weight, guys like Marciano, Dempsey, Fraizer probably could all be cruisers too.
Frazier, Marciano, Dempsey, Charles, Jones Jr., Spinks, theres a ton of them. Basically almost all of the old old school heavies, as well as all of the light heavyweights who tried to win heavyweight titles before the inception of the division. But under 200 pounds, nobody beats a prime Marciano.
enzo maccaraneli should of started off at light-heavyweight i always said that after he had picked up a world strap he should of then fought at cruiser he would of been real dangerous to any light-heavy with that extra mass off, im sure he would off been sharper and quicker to the punch aswel also his chin would not of always had to recieve the power of a 200+ fighter but eh you cant cry over spilt milk the guys finished