Skate Canada was obligated to choose among Higuchi, Miyahara, and Kostner, ie, the 1-3 seeds after Osmond declined GP. There is an undocumented, but often claimed rule, that the top three seeds get to choose their events in order of placement, after the host picks are selected. Even if this is a myth or only followed loosely, there is a draw for selection order among the hosts for each discipline, and SC may have drawn for late in the round. Similarly for skaters in the Top 24 SB: Medvedeva may have been the last skater left when it came time for Skate Canada to pick, although I tend to doubt this was how it played out.