Louis didn't have an iron chin and you need that if you're smaller than Klitschko. Louis would not get past Klitschko's jab and a few right hands would put him down.
Brewster didn't want to be there. And even if Wlad beats him a hundred times it doesn't erase him getting stopped by a mediocre fighter.
The Golota that fought Bowe would give Louis a hell of a fight, due to the size difference. Golota showed he had a good chin against Bowe & if he could keep Joe off of him, Golota might be able to out point him. Technically, I think AG is the better boxer. But Louis really knew how to land bombs & if he managed to connect, it could spell the end for Golota. It would be some war. Probably Louis would win. Golota looked so good vs Bowe cause Bowe sucked ass as a techincal boxer. The idiot couldn't throw a straight right hand for a million $$$, the rabbit punching fool.
Impossible is nothing, but seeing him fight, you can see things modern fighters could easily exploit. Joe Louis wasnt the smallest heavyweight, Wlad would still tower over him. Louis physique is more of a lightheavyweight, i dont know what his weight was, but i would be surprised if he was more than a cruiserweight. The difference in their physiqe would be big, too big. Then, the fighter from this era weren't that mobile. Joe Louis was standing in front of his opponents with the guard low. Off course his jab and especially his right hand were awesome, but he just wouldnt win vs. an 6"7 athlete who has one punch knockout power and a very good jab. Someone who is all around very technically skilled. I just dont see it. I dont think Louis would stand a chance vs Bowe or Lewis either.