I like the "Which one" ending very much. It just seems to fit. 

And that's absolutely what I mean by greater detail. The composition of space by showing us the windows and the well-manicured lawns really gives us a sense of place, which, by extension, then gives us a clearer sense of the characters as well. 

I don't know about Michael interacting with the four. I think his entering the story where and when he does works well. It could work, but it would be an experiment.