A couple years ago, Damon and Carlton asserted that Adam and Eve could give insight into the nature of the show and were also evidence that elements were contained early on. There's presently 16 different theories on Lostpedia about who Adam and Eve actually are, and most of those theories are pretty reasonable.
When the reveal happens, is that going to actually be evidence of anything? Almost any male/female pair is plausible at this point. As such, there's nothing that will prove that whatever revealed in season 6 is what was actually planned way back in season 1.