I'd pick Jim Jeffries in a 45 round fight. My pick would be Ali to win by torture stoppage, but the only way this can happen is over a very long distance against an ultra-durable opponent. Funnily enough, my second choice might be Jack Johnson, maybe clever enough to stay unstopped himself while absorbing a terrible beating before getting clever inside against an exhausted Ali. Both of these scenarios are long, long, longshots.
Not really, Spinks wasn`t as robust as Ali and Tyson landed tons of body shots on Ferguson without stopping him with those shots.
Don`t remember many heavyweights being stopped by a body shot, Tyson dropped Spinks with one and Kabayel stopped Sanchez with a decent body shot but the only otyher heavyweight I know of that stopped heavyweights with body shots was Fitzsimmons, I don`t count Dubois low blow v Usyk because he hit him below the belly button which is illegal because it means the punch would probably land in an opponents bowels which could cause them to soil themselves, which is why Usyk was in so much pain despite that shot not catching him in the groin area, having said that, a legit body shot from Dubois might do a lot of damage too.