OK, so I'm pretty sure the one in the picture in the post above and this one are the same and he has moved into the spot on the wall in the backyard. Not only does it look the same, but was immediately very tame when I approached with mealworms, even to the point of jumping off the wall onto my shoulder.
I get the impression that in the spring when they wake up, they won't necessarily stay in their old spot. This is the third year for Bill, but he has been moving around a bit and is nowhere to be seen today.
He's a handsome boy and he likes posing. Hopefully he'll stay around and I'll figure out a name for him.