1/5 is 22 points right? That is the same as the point Murakami gets last GPF. (Patrick is 1/5 too iirc, but he is special case because of TEB situation) It is still a slim chance but it is not none. Shoma and Jason looks like they will likely be at GPF. Unless both disaster-ed, Shoma should get to the podium at CoR and Jason at NHK. Should be enough for them.
I don't think using last GPF qualification is a good way to look at it because last year's was skewed by the non-result at TEB. Several skaters were damaged there that even the supposedly "fair" method of GPF qualification was not really fair.