I don't totally understand your question, but I'll try. I'm guessing scaling their attributes up / down too? Then Rocky would be freakish as a 220lber with his power scaled up comparatively, throwing upwards of 90 punches a round with a rock chin. Dempsey would also be a monster. Fitzsimmons as a scaled 220lber would be hilariously terrifying. This exercise works better with the smaller guys. Does almost nothing for guys like Tyson and massively diminishes people like Fury, Klitschko and Lennox.
Also, to not diminish heights and it's fighting style effects, you would have to figure out some original height : weight ratio for the fighter and then appropriately scale them up / down mathematically. But that is way too much for an esb thread which will likely end in a flame war.
I think Holy should stay outside, and use his hand speed to rack up point and cuts rocky to pieces. But since Ezzard had a hard time trying to avoid Rocky cutting the ring off, i guess Holy would be forced to fight on the inside and make it war.
I wouldn’t say he had a better chin. About even. Holy also tired far more easier and wasnt as good a boxer. Holy had great heart decent combos controlled the pace and distance well and decent power. Unfortunately it’s everything Marciano does better (except the combos). Marciano KOs him late rounds Holys only chance is a 12 rounder.
Marciano, with his style and physical limitations, would be garbage at 220. Dempsey, tho, would be excellent.
But that’s the problem with Holyfield. He’d talk, pre fight, about he was going to “box n move” then he’d get hit and wing ten punches back at his opponents like a madman. Rocky is going to hit him and Holyfield was too much of warrior for his own good. When it happens, Rocky could brutalize him.