Well I mean, take a zombie for example. It might be a person you knew, but I bet my bottom dollar it's not gonna be all buddy-buddy with you. That's kind of like our friend, Gwyndolin here. He functions just barely now because Aldritch wills it. Hell, even in the fight he makes horrible squelches of inhuman nature. So I'd say the Gwyndolin that was there has been devoured and is no longer even really there besides the partially digested torso emerging from Aldritch's body.
And I know he didn't choose to be devoured, I was more meaning like he was totally defiled by Aldritch. I'm also really bad at phrasing my words.