So Phantom becomes crazy? He convinces himself to be BB? Maybe he do so to cope with the pain (phantom pain!) of what he did...
Or he continues to be BB double as a "job", so that Outer Heaven gets founded but the real BB is safe, knowing that if the place gets overrunned (like the mother base in GZ) he is still safe, somewhere drinking a martini![]()
The phantom realizes he is a fake, and keeps rolling with it.