Wow that's really cool. Even if it is a bit far-fetched, it's still really interesting to think about. I might have caught a couple of the recurring themes in some of the movies, but I wouldn't have thought much of it other than Pixar just being their witty, Pixar selves.
Also this just reminds me of how little time I have spent with all of these movies. When I was a kid I watched all of the "regular" animated Disney movies so frequently that even now I can quote them all pretty much verbatim. Pixar didn't start happening until I was a teenager and while my love for Disney has never, ever faltered, I've realized that there are some movies that I've only seen once or twice, and some that I haven't seen at all. Point being that I've never watched any of the Pixar movies enough to ever make those kind of connections.