Well, what does stiff entail? Expecting the competition to be easy enough for a win? Even if you could argue that Skate Canada favours Osmond, last year, Japanese skaters came 5th and 6th... for example, Canadians didn't cause Honda to have a poor SP that practically took her out of podium contention - and as for the FS, fans of hers just wanted her to be marked higher, which is understandable of them. Osmond's PCS for her FS was high at 71.90 points (should have been just above 70, IMO), but it wasn't a personal best, and if you compare it to her PCS at Olympics, 75.65, it's rather appropriate actually. Not to mention, it wouldn't have affected the results of the competition.
Reigning World champion Osmond will be at 2 GP events, 2-time World champion Medvedeva will be at 2 events, World bronze medalist Gabby Daleman will be at 2 events, Olympic champion Zagitova will be at 2 events... and it's not like the JSF can send every Japanese skater to NHK/IdF/CoC/SkAm.
Mathematically, it isn't going to work out where Miyahara/Higuchi/Mihara/Honda all make the Grand Prix Final... eventually they will have to compete against Osmond/Medvedeva/Zagitova, who are big favourites regardless of where the competition is held. Yes, as I said, Russia/North American GP events are hard for Japanese skaters (not that it stopped two Japanese skaters from earning gold/silver at Skate America with strong skates). But ultimately, home ice can only go so far. Otherwise, we should all worry about any non-Japanese skaters braving the NHK field, since that competition arguably favours Japanese skaters that are on their home ice.