If Schumacher is still fourth after the first lap, and nothing strange happens to the guys in front, then I think Michael will be looking backwards towards Alonso and Vettel rather than challenging those ahead.
I still see Vettel challenging for the podium (though not the top step) if he can get more out of his tyres than the others like he did in Spa. As for Alonso, if he’s still tenth after the first corner, then I think he’s out of it for the win. Very often, though, we have seen Alonso make up a lot of places on the first lap due to good driving and good fortune, so if he’s P5 after lap one, then anything is possible.