My (unrealistic) wishful thinking..
MSR - Gilbert
Ronde - Gilbert
G-W - Van Summeren/Breschel
P-R - Chavanel
Hope Gilbert can pick up one of those anyway. I reckon he could hold an attack over MSR's last hill. Maybe Chavanel can get top 5 if he's lucky in Roubaix, maybe top 3 if he gets in the right break. QST 1-2-3?
Still, it's pretty useless guessing until we have the full startlists, and even then...
I think that, realistically, Boonen or Devolder will win at least one of Ronde & Roubaix between them.