we don't KNOW Dr. Rolf is involved, although it sure is easy to think so. Frankly, I don't care about the door initials, I do not want to see Salem filled with the Walking Dead. In some cases, I can accept that people were thought dead, but were still alive, barely. This was the case with Will.
At the time of the tunnel explosions, the police, EMTs, morgue had a lot to deal with. Many were injured or died. Yes, I could see Jack thought to be dead, his personal effects collected into an envelope, he is put aside to be transported later, along with dozens of others, and he wasn't dead. He came to, perhaps walked out. ????? But had no idea who he was, etc.