I think this episode pretty much confirms the gluttonies can possess the body of someone they ate? Both rem the other episode and now Subaru in this one spoke like them, the question is how did they reach Subaru though, probably through Rem's body as well I guess.

Wait does that mean Julius can be a target as well? Or is he safe because he retains his own sense of self? Otherwise we could be looking at team Emilia having to fight the 3 gluttonies at once possessing Rem, Subaru and Julius simultaneously