I just don't see Marciano surviving going toe-to-toe with Tua. Marciano just wasn't big enough to survive. Tua isn't an all-time great, but a prime Tua would be tough for anyone to beat, and the Rocks style would make him too accessible to getting hit by flush shots by the Tuaman. If Rocky was put down and hurt by Walcott and Moore, just think of what would happen to him getting hit by Tua.
I love it. Tua beats Marciano because he's fatter. What's next Butterbean beats Joe Louis? Tua's an ATG because he almost beat Ike I. Ike's an ATG because he beat Tua. I've seen circular logic before, but never a circle quite this small.
Not everybody can get a figure like Ken Norton because of a genetic component, but that dosnt mean that he is better conditioned than them. I am an ultra runner and I dont have an unusualy low bodyfat percentage but I would consider myself better conditioned than your average male model. The bottom line is that you would be hard put to find a better conditioned heavyweight than Marciano this side of the 20 round limit.
There is a difference between 'conditioned' and 'not an ounce of him' and its not genetics its just his bodyfat percentage isn't that low Fighting 20rounds plus doesn't mean you have better stamina either. Its like saying an average runner who runs marathons has got better stamina than Keninise Bekele because Bekele only does 10k I'm also not convinced Marciano is the best conditioned HW with the likes of Holyfield, Ali, Frazier, Vitali Whats the furthest you've ran Janitor?
How would they beat Tua??? Tua never struggled with a fighter who came at him. In fact I cant think of any that made it past two rounds. ATG or not, styles make fights, Tua punches harder than any of them, and has a great chin. No way they outpunch and outhustle him either.
Tua did struggle against Ike, who came at him in the early rounds. Tua couldn't get his own punches off when Ike was bombing on the inside, having to wait until his opponent was done throwing before starting his own offense. Tua never faced or beat a slugger ranked in the top 10 either, Marciano beat the number one contender and Jack Dempsey heir apparent on his way to the title. One of Marciano's best performances and easiest nights at the elite level was against Rex Layne, a bigger, stronger, swarmer who was in his face and crowding him the entire time. No having to chase down a counter punching cutie, Rocky showed surprising hand speed, strong defense, and capable combination punching in close quarters. Layne's plan to overwhelm him with his superior size and power was a disaster. Layne actually had better credentials than Tua with wins over Turkey Thompson, Henry Hall, Satterfield, and Walcott. His performance against Satterfield is one of the better displays of durability and late one punch power at the elite level. He was the favorite over Marciano because he was expected to beat the smaller brawler and instead he got stopped cold for the first and only time in his career.