Don't forget Mitsuki Sumoto who has just turned senior and has a JGP silver. But Hiroaki had a nice result at the universiade, so he might be considered too. The other two don't stand a chance IMO. And there's always the possibility that Daisuke does well enough in an international competition to get selected.
Sumoto still has one season to skate at the junior-level (born 2001), so he'll probably do JGP? He has good chances to qualify for JGP final again.
For Takahashi, I thought he didn't want to do international events? But of course he would be the best choice for the audience