Helenius severely injured his shoulder before Chisora to the point that they had to replace the muscle, and then also had a broken wrist and hand in the following fights. I don't think he still has the power that he did prior to Chisora though. I think his goose is cooked.
The Frenchman will whip the Swede like Swiss Miss hot chocolate. Helenius is a big goofy Euro bum with no power.
I'm convinced that he just spare his hand (thus power) for the right opponent in a title fight. Strategical move in the long run, then he will smash yet another football coming in his way.