[Coldsaturn]

MC often accesses her past memories in dreams and very brief hallucinations/flashbacks, but Zayne was pretty much the only LI explicitly looking at another reality through his dreams. That Raf can dream of his past is still only a theory, he might literally just have those memories with him.

(You'll have fun with the Death&Rebirth main story chapters)

Yes to the last question. Definitely.