It will be a good, competitive fight in the early rounds, but then Helenius will "turn it up" and knock him out in the 9th or 10th round. But there's always the chance that Chisora will land something big, because he's a hard puncher and Helenius isn't very difficult to hit.
DelBoy's in good shape, and will likely come in at a ready 235-240. 21+lbs less than his Fury loss. But does DelBoy have the chin to withstand those combinations and the consistent aggression, and does he have the smarts not to be hypnotized into thinking Robbe is slower than he really is? My guess is his chin is solid, but no moreso that Peters, Brewsters or Liakovichs, and I can't imagine if he is having success while robbe lulls him that he would pick up the tempo as the rounds go on....... My guess is Helenius T/KO 9-11
Helenius will stop him at some point during rounds 7-9. This will likely not be a stoppage with Del Boy on his feet. I expect him to be counted out on the mat. But, it will be quite a fight until then.
Robbe knocks him out in round 7. Before that it might be pretty even match to that point, cause Robbe is slow starter, but once he finds out how Chisora acts, move and reacts when gets hitted, he will simply blew him away.