Assume its the version that beat the historically greater fighter. 15 rounds 20 x 20 ring, 10 point must scoring. Schmeling vs. Sanders Ingo vs. Marvin Hart Choynski vs. Braddock Douglas vs. Norton
Schmeling beats Sanders Ingo beats Hart Choynski vs Braddock (undecided) Douglas beats Norton, although could go back and forth because of styles.
I think Sanders takes Schemling out, but its not a sure thing. I'd pick Ingo over Hart ( could be a good fight ), Choysnki to easily beat Braddock on points, and Norton vs Douglas, a true coin flip. I'd side with Norton's faster hands, and body attack, but a focused Douglas was something.
Not sure why Choynski makes the list exactly, but I will bite: I think that Schmeling would have picked Sanders apart and stopped him. Ingo vs Hart is actually a pick em fight. I am inclined to go with Ingo because I suspect that he would brain Hart coming in, however he would soon find himself in trouble if he couldn't do this. I would favor Braddock over Choynski at his best, because the better heavyweights tended to get to Choynski somehow. I would pick the best version of Douglas over Norton, but any other version not so much.
Corrie Sanders was maybe the most terrifying heavyweight in the world for nine minutes in my opinion. It wasn't just his power. It was also the speed. Baer hit harder than Sanders and Schmeling hung around and did great work against him, but I have to think that Sanders, who was much bigger and much faster than Baer would have found a way to land something seriously damaging on Schmeling early. If that's the case, its not difficult to image him following up and finishing Schmeling off. Ingo would punch Hart's head off of his shoulders.