The award is not given to the horse that people think is the best. It is given to the best performed horse of that year.

Im a HUGE Courageous Annie fan, but I dont think she can win it. She won only 1 race of note and didnt compete in any others.

Forever Gold besides winning QLD Oaks. won the triad and also placed in Gr 3 Gold coast Oaks
Vertigal, besides winning Breeders Challenge was also placed in Gr 1 NSW and Aust Oaks.
Baby Bling besides winning Aust Oaks, won Gr 3 Gold Coast Oaks and 4th in Qld Oaks

If Bellas Delight or AML win the breeders Crown, then i think they jump to the top of the class.