Wait a minute, you might be onto something. Enlighten us with more please
Well… For me the very first thing that got me thinking is the way Little A's uncle/Mr. A is portrayed in his POV. It's always this beefy-looking old man, while in K and other hybrids' POV, it's a man that looks exactly like little A. Also the way they are remembering Mr. A's personality is different.
Also, there's a scene in chapter 12 where Fluffy is clinging to a picture that has a younger little A on it with his mother and uncle, or so we thought. What if that picture is actually a younger Mr. A, and that's why Fluffy is clinging to it so much? I mean, sure, the uncle is also in the picture, but he wasn't really the focus of it.
I'm sorry if it's confusing; English is not my first language. It's kind of hard to explain, but so far I think Little A is a replacement for Mr. A, possibly because Mr. A, as we have seen, also became a hybrid, and he is not as obedient as they want him to be.
I don't know if it makes sense, but what if Mr. A and Little A are just the same person, or at least Little A is just a clone that also has the memories of Mr. A?