Just the guys who fought Louis for the title. To get the obvious issue out of the way let’s assume Cooney was at his best for all those fights. In reality of course Gerry didn’t have the longevity for all those contenders. So let’s just take each fighter on a one at a time basis
I'll throw in Abe Simon and Buddy Baer at having a shot at beating Cooney too. Who knows how Cooney would do over 15 so would Tommy Farr be out of the question?
Simon and Buddy to slow and static to be a problem. Cooney gets rid of them both fairly quickly me thinks
The problem with this is that you are giving Cooney the two attributes that he most conspicuously lacked. Consistency and longevity.