Paddy Power have Sagan and Spartacus out front as the favourites
http://www.paddypower.com/bet/cycling/paris---roubaix
Surely it won't be a repeat of Flanders. Interestingly, Gearing Thomas is in there at 33/1. Could be worth £2 on G.
That's right. It happens. Bizarre, but there are rules in place to ensure other riders can't attack whilst rivals are held up. The rules are usually observed.