I think Chambers should go for Povetkin. Which is what I thought before going after Klitchko. I think Chambers KO's Povetkin.
Chambers has a huge stamina problem, which is why he throws one punch per round. It would be just like their first fight if they fought again. Useless rematch.
Chambers didn't have a stamina problem in their first fight, he had a scared problem. Povetkin shocked him with power he wasn't expecting, and Chambers has never gone away and virtually quit like that since. It was a learning experience, but also Eddie's biggest failure. Chambers' stamina is fine for a heavy. I think a relatively fit (he's still going to have a spare tire) Chambers, not encrusted in ringrust after a few tuneups, UDs Povetkin in a rematch.