Thanks, guys.
I did not intentionally change the shadow party... but I may well have goofed it up when I was experimenting with various actors.
FuSoYa SHOULD still be the last character added to the shadow party, but if not him, then Cid, so I'm not sure why nobody loaded at all.
I really don't wish to change this scene, so hopefully I can set things right again but making sure that the shadow party configuration is consistent with what is used in the original game.