I don't get what's happening with PD and Rose in that "HesSwap" post?
As the game says Hessonite loses her Prism because of Rose Quartz, this AU starts with the premise “what if Hessonite won against Rose Quartz?”
Basically she didn’t think too much and shattered her as soon as she had the chance. After all, she was the leader of the enemies, right? Getting rid of her= end of the war.
BUT… she shattered her, and in that moment Rose’s form “glitched” and in horror Hessonite realised Rose=Pink. Her shattered gem confirmed it.
Emerald saw what had really happened, but the gems who came later just saw Pink’s shards and thought Hessonite was secretly a Crystal Gem, so the Diamonds decided to attack and corrupt all the gems on Earth.
Topaz, who doesn’t know anything, just thinks Hess shattered Rose Quartz and genuinely believes they can’t contact HW because they have no resource (but the truth is that Hess and Emerald destroyed every form of communication). On Homeworld, gems think Hess shattered Pink purposefully.
Steven will later find out both stories are true.