Crawford is probably the closest at the moment but I don't know if he will ever get there unfortunately. Spence has a decent shot but he probably has to beat Thurman and Crawford at least to get there. It's definitely possible.

Canelo could if somehow he does beat GGG and dominates the MW division, but I just don't think that he will continue to fight the best even if he does beat GGG. But in reality, I think he would become a superstar because of where he is from and not because he is the best in the sport.

At the moment, I see nobody else on the horizon. You never know who could come out of nowhere though like Pacquiao did.