First it was him as a guardsman that died defending the emperor. Then it was a space marine. Then it was a custodes, then it was him again? Now he has been a perpetual who has known the emperor for thousands of years and ends up in the heresy after Calth gets fucked by the Word Bearers and is trying to make his way to Terra through the Warp or something.
I get that is all being told after like 10k years of history, and things can change but still its just weird lol