i definetely wanted a merge as a closure but i much prefer it being a few Karins, can't imagine having to write so many karin's while keeping all as relevant.
Pretty sure the author only puts that in to explain his connection with Okaya and why he is a shithead. No need to feel bad for him. I'll be eagerly awaiting his brutal death soon.
On one hand, she now technically has an ally against those DEMONS. On the other hand, if he messed up, her plans could be jeopardized. This would be interesting.