I would love for them to be allies! Can say we established in our thread that Verstael is different in a few ways from the people at ShinRa and thus has Sephiroth's interest and he 10/10 appreciates the library and concrete plans for leaving the city.

They should discuss things further and see what happens since...ironically Sephiroth feels comfortable in this familiar setting that he would ordinarily not prefer, so he'll be around a lot.