Just for the sake of it ... name 4 names who have yet to fight for any of the 4 HW belts but who you expect will fight for one at some time in the future. (WBA regular, and other secondary/pseudo belts don't count). They can be obvious choices like some of those below or outsiders, doesn't have to be 'most likely'. Also, it's 'get a shot at a belt', not necessarily win one. 4 from me are: Makmudov Jalolov Justis Huni Vianello (I think he might be managed into position)
In the next 2-3 years: Joyce Hunter Dubois Hrgovic Yoka 4-5 years: Conto I'll leave Usyk out as he is effectively on deck already for a shot.
Audley Harrison. Such untapped potential I am thinking he still may have enough “lead in his pencil“ to contend for a title LOL
He's similar to drug cheat Jarrell Miller. Needs to work a bit on his defence but the potential is still there.
It's always hilarious to look at these "in the next *** years who will be doing what" ............................