If he has continued to work on his striking - including hard sparring - then yes. The time off would have done him a world of good. If not I hope he stays retired.
who would he fight ? every one at the top of the HW division has kicked his ass already.
Umm... no. The only two unavenged losses are to Cain and Overroid. So how has every one of the top heavyweights kicked his ass already? He beat Carwin and Mir.
That is not dead which can eternal lie and withs strange aeons even death may die.