He seems to want to be active now, and maybe regain a title. His skills are completely exposed and the MW division is stacked with decent contenders.
Once he gets his confidence back he'll be dangerous for anyone 160-168. You need a decent chin & a disciplined performance to beat Arthur, with his power it only takes one good shot.
He fights Wilczewski next week. If he wins, he'll most likely fight for the WBO SMW title (currently hold by Stieglitz) next.
He'll always be dangerous... but he wont beat two top 168ers in a row. At 160 he will be far more effective.
I wouldn't mind seeing Abraham-Macklin. There's lots of fights at 160 for him; Golovkin, Pirog, Murray, Barker etc.
It's really sad he couldn't go down to MW. :-( He'll probably defeat Piotr and then fight Stieglitz. I see him winning by TKO or KO. Maybe a few defences, then he'll hang them up, in a year or two. :hat