New questions and the hope of old questions answered

In the last episode "The Substitute," a lot of significance happened, but I'm just going to jot down a few things here.

How many are with me in thinking that the boy following Locke around and being chased by him is Aaron. Yay! Since season 1 we've been waiting to learn why Aaron is so important and now we’re going to finally find out. Yay!

But wait…Aaron was left in LA. If that’s the case, what’s he doing on the island? Unless, he can teleport (or bilocate) just like Walt! Double triple yay! So the unanswered questions about "supernatural Walt" are actually going to have relevance again and maybe get answered! Maybe somehow Walt and Aaron are members of the same class, or order, or whatever. My son has the theory that they will be the new Jacob and Man in Black.

Also (from the cave where Locke took Sawyer):
4 John Locke
8 Hugo Reyes
15 James Ford
16 Sayid Jarrah
23 Jack Shepherd
42 ?Jin-Soo/ ?Sun-Hwa Kwon

What, if anything, is the significance of this order of names. And what does it mean that Kate’s name is not included, even though she was touched by Jacob?

Well that's all for now. More later.