Well, as I asked before, since R-By is a mesh of a demon, angel and fallen angel (and a little bit of human), would the Other Place still be a risk for him?
Also, he can basically produce light from darkness and he is pretty resiliant, so even if you send him over there, he'll probably study the spirits and end up devising some kind of ritual to return, if that is at all possible.
He could also try to use his Dimension Shatter to stop the portal from sucking him up, but I dunno if that would work. It basically stops any kind of teleportation method, so I dunno...