The Arreola/Stiverne winner gets beaten to a pulp, stopped easily.
I don't know much about Pulev. TBH I know nothing about him.
Same with Boytsov.
Adamek/Cunningham winner would be two good recognizable names that have proven themselves.
Helenius lost to Chisora, he needs to prove himself.
Povetkin is another one I want to see Wlad face.
Wilder, Mitchell, and Price would all be okay opponents as well. Neither of them are proven though.
So Adamek/Cunningham winner, Povetkin, and who ever proves themselves first of Wilder, Mitchell, or Price.