In reference to Richard saying to Sun " I remember because I watched them all die" This was said in 2007.
The one thing I never understood is how did Richard not realize who they were when he first started to meet them and know about them in 2004. It's the same Richard Alpert who said he saw then all die as he was in the year 2007.
Why wouldn't he recognize them? I understand Ben because the Temple changed him.