TL:
Finality — that is, the theme of Version 5 — is the IF line. Mikhail, for instance, isn't "resurrected"; he's a "Mikhail" who was simply alive in another world line. In other words, some of them may not be characters from our world line — they're IF-line characters — while others are from our world line.
PS: Being alive in our world line doesn't mean an SP isn't IF.