I agree that it seems strange that you don't hear about Alvin in the end cutscene. But then again, you don't hear about many other things. It doesn't answer many questions.
About the amulet, I just assumed it was common for people with the source to wear those. Though if the amulet is "handcrafted" and that no 2 amulets really look alike, then its a clue, since he sais it looks identical to the one he gave Alvin, only that it looks more worn.
Though, as far as I remember, isen't Alvin blond and the GM black haired?
Plus, all that travel in time, not sure how it would work. Plus, why would he want to be Alvin if he can remain being the GM.
I agree, that there are some things that point to those to be the same, and its probably right. I would just wish there would be some more proof. Much of it seems to hypothetically(sp) for my taste
.