system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] What if Sanguinius didn't die above Terra? During the Horus Heresy?
gpt
Basically the same thing that would of happened if any loyalist Primarch were to survive. They would become the defacto new EoM and would either intentionally or unintentionally prevent the rise of the Ecclesiarchy because there would be no power vacuum to fill . They would still be reeling from the death of the big E and the loyalist Primarchs but it would have a single point of clear undisputed leadership and as a result would get its feet back under it much quicker.