I was messing around earlier and did a playthrough where I rejected everyone except Lin. In retrospect declining to save Mina was a bit dark, and also does not bode well for the future plot due to bird requirement. Eventually I did manage to get stuck as after getting back to Bow with Yua we go to Trouts mansion but the guard wont let us in...
Since you made it so that we are not required to recruit characters, im curious what do you have planned for the story after trout anyway?