The UESP list him as leveling up to 53. The ability to thrall has always been hard capped, 40 or 48. I suppose though gamesas might tweak it- but my intial elation of bagging Sasquatch (literally, picture George Muerson. In a robe with hood. Summoning gargoyles. NOT MOANING. and even retains some dialogue - like a dremora.
I wish only for greater skyrim minds than mine to kick this around and see what they can glean from it. The UESP's wrong, caps at 40? Maybe I'm a wear wolf vampire and I dunno it? or maybe, just maybe, what we thought we knew about skyrim is going to pleasantly, or unpleasantly, surprised.
Been here along time, not posting, just reading. I remember a guy who built a house of cheese, that was knocked down by a fox. If anyone knows if he ever got it built, much appreciated.