Nobody's favorite Pixar movie is Cars, even though it is far and away the most profitable Pixar film. However, if you ever had any biological questions aout the Cars franchise, which I know you have, this video will save you a lot of time.
YouTuber The Film Theorists have once again thrown another crazy, obsessive conspiracy theory that take every aspect of the film from its magical origins to their killjoy conclusions. Connections between the Pixar movies must exist in unified universe, so he can force theories like the Cars in Cars are bugs or something.
Anyway, these are impressive and entertaining ideas, but also not that important. I'm not sure why you would spend so much time only on the surface of a film, instead of actually engaging with the meaning of it, but hey it's just a theory... a film theory.