Ok , first off, I believe that Rey is the Stellar to GIl's Neo. The way he acts seems similar, though not to the extent of Stellar and Neo.

Secondly, I wouldn't be surprised if Rey was a clone of Raww. Certainly would explain a lot of things...also, that could be why he kept egging Shinn on when it came to fighting the AA and Freedom.

Finally, remember the Druggie pilots from SEED? I remember at the beginning of Destiny, someone (Neo I believe) compared them to Sting, Auel and Stellar, saying that they were "Better than the other three."

Well, judging from his reaction to finding that lab, I believe that he had something to do with the whole Extended thing. Maybe he's one himself, just not to the degree of Stellar and co.

All in all, after watching 36, quite a few things concerning Rey are made clearer to me.