A new theory emerges: Mr. Mistoffelees is Macavity.
Or, rather, Macavity is Mr. Mistoffelees. He is older, after all. Now, to begin-
Is this a serious theory?
No, and please keep that in mind.
That said, let’s start with a comparison of their powers. What do we know Macavity can do? Well, he can control or freeze-in-place other cats, at least to some extent, it seems. Mr. Mistoffelees has, in turn, frozen a few cats “playfully”, and (here) is a link to him “power possessing” another cat. Most damning, what do they have most in common? If you go looking for either cat, they aren’t there!
(I would also argue that Misto’s control over light is mirrored in Macavity, making the stage red and inducing confusion, but of course who’s to say?)
Let’s look at Quaxo’s other name, now: quite similar to “Mephistopheles,” isn’t it? That’s a hint… or, is it? Is this tuxedo Jellicle actually Macavity in the flesh, doing the same thing he did to be Old Deuteronomy, or is he just some poor cat being possessed? Has Macavity broken the Three Name Rule? Truly his most hideous crime, if so.
Theoretically, let’s say it is Macavity. Why was he not caught out like he was pretending to be Old D? Well, perhaps he wanted to be caught.
What? You’ve lost the plot.
No, hear me out! Macavity knows that he will never be chosen to ascend and be reborn. Then, when he dies, how can he continue to wreak havoc? No, he needs to be chosen, but how? …A new, adorable cat, who has done a very great thing for the tribe will certainly be chosen, some day. In the mean time, he can’t help but call funny, talented cats “terrible bores”.