Pacman's camp prefers to fight Danny Garcia but it is Pacman's choice who will be his opponent but i believe he doesn't want to choose which one it is since he can fight anyone regardless with their age and record just like what he proves already before.
He can choose anyone on the line but it's better for him to choose a fighter that he has a great chance of winning, so he cannot retire early.
Manny made history in his sports, he has nothing to prove, and I don't think he needs to keep proving that at 40 he can still fight, next fight he might be 41 that time and sad to admit, he is not getting any younger, I'm afraid he will get some serious injury if he keeps fighting younger opponents.