Helenius was one of Haye's sparring partners for the Klitschko fight, Haye battered him so badly (with headguards and big gloves) that Helenius was sent home after two days
Still gonna say Haye. We don't really know how well Hellboy takes a hard punch or what his reaction's like to getting knocked down, and the few times he fought fast punchers he looked very hittable. Unlike Wlad his footwork's pretty poor, and he tends to let opponents dictate the fight for him rather than the other way round. Haye, I think, would pot shot him from afar and either take him out or win a decision.
Helenius is coming on leaps & bounds. Hayes done nothing to impress me at H/W His survival tactics & ridiculously low punch out-put bore me to tears.
I think Arreola vs Helenius would be a great scrap.