Theo will start, he always scores against West Ham, always.
Arsenal still have not one good striker, so unless Santi turns up, won't be many goals - as usual.
Most likely something like Arsenal 1-2 West Ham
For some reason Arsenal have been playing less defensively since they got Cech, which is the worst management decision ever but let's just deal with it. Payet is outstanding for West Ham, if West Ham get it right they'll win.
Arsenal are the better team, just don't see them winning today.