Here's official confirmation--photographic evidence, if you will--that Adam is indeed the "old friend" who returns. I know I'm repeating myself, but I really, really wish it was BDW. I know Jeffrey Dean Morgan is a big movie guy now, but you're telling me he can't find a day or two in his schedule to fly up to Canada and reteam with the boys? Okay, I'm done whining. Here's the Adam pic, and a whole lotta Zachariah.
Spoiler source: The CW