So we already have this, the highest chance has the lowest return. Yes, it wouldn't be Floyd Mayweather and it won't be McGregor for sure. The crowd's favorite that it would be Spence or Crawford. Am I the only one that wants to see Thurman - Pacquiao 2 and Broner - Pacquiao 2?
This is just for the odds to be the next opponent this is not the current odds for these matches.
ADRIEN BRONER might not ever set foot inside a boxing ring again if he cant keep himself out of trouble

Some interest in a ONE TIME rematch but he will have to defeat some others contestants before given such a opportunity again.
This is likely, I don't know what's the issue with him but you are right and this is possible that he has to defeat other fighters before going back to Manny or given a chance to have a rematch.
But if Manny is interested with this rematch and he wants to fight against him again, I think that it would be enough to declare that this fight can happen.