I asked a question earlier as to why Ibis isn't included, it's because Ibis stays aren't eligible for US Airways dividend miles, and only certain rate categories for the other listed Accor hotels are eligible. This is off Accor's partner website FYI (and mine):
*Qualifying rates for Miles:
Sofitel: Premium, Smart, Early and Corporate rates
Pullman: Best unrestricted rate, Event rate, Early Booking
MGallery: Full rate, best unrestricted rate, Promotion rate with conditions
Grand Mercure: Full and Best unrestricted rates
Novotel: Full and Best unrestricted rates
Mercure: Full and Best unrestricted rates