Didnt Gabriel seem like he was in a self-imposed exile?
He visibly didn't look like he had drank blood in a long time, his lair was in shambles and certain parts looked as if they were destroyed by him or something powerful, and it was clear that he could've left at anytime but, for some reason, didnt.
Now, I know mirror of faith will likely explain this, but does anyone think that perhaps Simon does or says something that resonates with the aging lord?