So are all the characters in the same location, no exceptions? I kind of envisioned Gorou coming across the group during a battle or while they were on the road, since he's a wanderer, and then he would be recruited or be drawn into the thick of things by circumstance. He does do mercenary work, so if I have to I can come up with a reason for him to be there, but it also seems kind of weird for the Crown Prince to have an unknown mercenary as a guard rather than proper knights and soldiers.