Very hard to tell with Kovalev. I'd make him a 60-40 fav against Stevenson. It's a [very poor man's] Hagler-Hearns, super hard to call. I think Braehmer loses a wide UD to Stevenson. The German would never take that fight though.
FAvour stevenson by KO but you never know. Groves has the power to KO him aswell. He's levels above Bellew imo.
I have it slightly infavour of Stevenson . . . but it is pretty darn close match-up either way that is must see TV. I give him the edge because he is improving with every fight and see him having enough experience to deal with with the fundamentally strong but slower Kov.
Kovalev should fight someone like Pascal or Braehmer. Braehmer has good power, and we might see how Kovalev does on the back foot. Pascal is a good scalp for him to put on his resume, and would tell us how he does against a slick, athletic fighter.