But if he swallowed that demon why is he still there.he said that a seed of himself still there and that there's a possibility to come back so he actually didn't swallow him completely? Is it because he's not strong enough? I hope so it's dangerous to have that demon around him making plans to take over his body or how to kill him so I hope that once he gains more power he disappears.it can't be that every demon he swallows is gonna follow him right 
that's just crazy I just can imagine how that would look