Put me in the camp of people who think he has been here before, in the forums.
In fact, I think there was a pretty active user here, for quite a while (keep in mind I'm speaking of when I was on here a lot, which was a few years ago) who was considered a troll by some, a friend of sorts by others, who was actually him. Got some warnings I think and maybe even a temp ban, possibly. Was on strangely good terms with some mods, but in an odd way. Hard to explain. Don't know if the username still posts, I havent been here in awhile.
Ask yourself this: Is Morrissey obsessed with his image? Yes. Does he like to argue? Yes. (Do I luz him? Yes, but that's beside the point.) Does he have lotsandlotsandlots of free time? YES. Does he frequent the internet/email/surf? YES!
SO... how could he have NOT been here?