To me, it's pretty clear that it was Ramos. Sure, we don't know for sure, and we probably won't ever know for sure, but if you want someone to blame, I believe that's our best bet. Honestly, do you really think that a sicker than sick child molester in that close of a proximity to Etan wasn't responsible? I think it's very likely.
We can also go ahead and speculate whether or not Etan is alive. Either way, his life was taken from him in one way or another, and in both circumstances, his parents lose. There's nothing right now to indicate that he is alive. But if we've got a convicted child rapist who targeted boys who fit Etan's profile, do you honestly think it was anyone else? Probably not. I don't buy his story for an instant. He's willing to admit to other crimes, but if you think about it, it's not really that hard to cop out when you've already been charged with other similar crimes. So sure, Etan just might be alive, or he might be dead; I think an individual like Ramos is capable of almost anything.