Last night I was working on my future bedroom and saw some eyes out on the porch roof. I opened the window and the cat didn't run off. With some encouragement it came over for head rubs. It was Jack-Jack with a new flea collar. I climbed out on the roof and Jack climbed up on my lap after a few minutes. That got rid of any doubts of who it was.
He came inside for a bit and then left. Later he came back in, hurried down the stairs, through the kitchen, tried to go out the closed kitchen window, then stood by the door until I let him out. He stood on the back step rails and watched the other cats. Then slowly started rediscovering his old turf.