Helenius is a stiff Eurobot with no head movement, Chisora beats him in similar fashion to the first fight if he takes the rematch. Vitali is a the best heavyweight h2h par Lennox. No shame losing to him with just 17 fights prior.
Of Chisora's 4 losses. He beat Helenius despite not getting the decision. He gave Vitali Klitschko his toughest fight since Corrie Sanders. He came fat and out of shape against Tyson Fury at 261lbs, only has himself to blame for that but a 235lb Chisora beats Fury any day of the week. He came overweight against David Haye at 247lbs and lacked the mobility or speed he needed, lost fair and square but if he'd hung in a couple more rounds Haye may have gassed completely. Chisora has had his up and downs in his career so far but he's finally got his mental and physical side sorted out and will now be a force against any Heavyweight out there.