I'm not even sure I'd start Brees against the Seahawks, never mind Schaub. Manuel can do a few different things; I'd roll with him (with low expectations).
Cutler and Kap both look brighter; I'd go with Cutler by an eyelash just because it might be bombs away in Detroit. (Unless it's 4-pt passing TD/6-pt rushing TD; that would be enough to tip it toward Kap.)