Let's hope it doesn't come to that. They explicitly told us we can't trust Oboro so I think him joining the enemy's side now would be kind of pointless. It would be best if he stayed with Ageha and the others and just kept his neutral, self absorbed stance. He is obviously still in love with himself and fascinated by Ageha so I expect him to stick close to him.

It wouldn't be too bad if somewhere down the line, after things have developed a bit, he decided it's his destiny to rule the world or destroy it or whatever but I think its too soon for that. They're still really weak and he is still just a drifter, besides the enemies seem to have enough elitist asses as it is.