I think it is ridiculous to suggest that Kimmie could win the OGM.
First of all, EVERY lady OGM winner since there was a Ladies FS event in the Olympics has stood on the World podium before winning the OGM. Every single one.
Kimmie has never competed in an ISU senior championship event. When skaters like Irina and Sasha are getting high 7s and 8s in their PCS scores, Kimmie is getting low 6s, and with good reason: her spins, spirals and footwork are not anywhere near at the levels of the highest rank senior ladies.
Bottom line: a skater like Kimmie cannot beat an Irina, a Sasha, or a Shizuka on jumps alone---and Kimmie's jumps have been consistently downgraded by the caller in her GP events. Kimmie is a very promising skater, but her skating is still in the formative stages.
Both Sarah and Tara had multiple years of competing against Senior ladies---and medaling, and winning. Kimmie just competed in her first year on the GP and did not medal at all. The one and only international event Kimmie has ever won was the 2003 Slovenia JGP.