This coming episode I imagine we're going to see that Caleb has designed rooms for each member of the M9 in the Mansion, probably with lavish descriptions.

I would love it if Caleb has a room he designed for Essek, even if he doesn't expect Essek to use it anytime soon (or even ever). Maybe it's tucked off in a secret corner in the mansion and Caleb visits it sometimes and gets wistful thoughts about if Essek would like it or not.