So are the corrupted Star Guardians corrupted from the Dark Star??
Alot of people I know are saying the Zoe, Xayah and Rakan SG look alot like a Dark Star due to having main give aways to what a Dark Star's appearance is even if they are a corrupted being (Like Rhaast/Kayn or Jhin) They contain features of the Dark Star
Main Dark Stars (Stuff that didnt corrupt a entity Kha, Cho, Thresh, etc): Lots of purple and dark colors, black hole somewhere on body or weapon, and some can have a 4 pointed star like Dark Cosmic Jhin's face when he has his forth shot and has his mask off and Kha'Zix
Rhaast: Dark colors with the black armor and purple somewhere on the body, Black hole, faceless, and containing stuff from the universe with the golden Ora
Jhin: Dark pants and arms, Purple all around body, Black hole gun and shoulder piece, faceless head, 4 pointed star
Now looking at the SG Rakan, Zoe and Xayah
Zoe, Xayah, Rakan: Dark purples and black, 4 pointed star on her eye and her familiar, and ofcourse has Star Guardian features
Unless its a coincidence maybe these Star Guardians are corrupted by the Dark Star in some sense. You can even see Xayah fix her corruption when she touches her gem so maybe the SG magic repels the corruption slightly?