OK, saw the finale. Some random thoughts:
1. The man on the beach with Jacob watching the Black Rock approach is clearly Jacob's brother (call him "Esau" if you want), and he and Jacob are at odds over the island.
2. The man representing himself as Locke is that man ("Esau"). Locke is dead. Dead is dead, you don't get to come back from that.
3. The smoke monster works for "Esau".
4. Richard may be Egyptian (the ankhs, the Egyptian god statue under which Jacob lives, etc), but Ilana called him "Ricardus" and he spoke to her in Latin.
V. The writing on the tapesty Jacob weaves is Greek, not Egyptian. Not sure what that means, but could represent a battle of the ancients, Greeks vs. Egyptians, kind of thing.
6. The nuclear blast didn't kill them, but I'm not sure it changed anything either. Just a hunch.
7. I still think Ray, Christian, Jack, Aaron and Jacob are related, and that Widmore is related to "Esau". I think Richard works for "Esau", not Jacob.
I'll need to digest it more. And maybe drink some Scotch.