It's been a long time since Chava has won a cobbled race.
He's in very good form and I expect him to be OPQS' first choice on Friday.
Sagan will probably want a revenge, but Cannondale's numbers and Sagan's experience aren't convincing enough for me.
I think Cancellara will keep his powder dry, and besides that I think his current form isn't like it used to be at this time of year previous years. Probably he realized that the age narrowed his peak period and decided to shift it a week later than previous seasons.