So… Unfortunately I’ve been thinking about AHS: Coven again.
I have a theory about why Cordelia was able to become The Supreme:
•Zoe was next in line to be supreme all along. She displayed all of the 7 Wonders early in the season.
•Madison was the next in line to become The Supreme as soon as Zoe died from transmutation.
•The Supreme’s powers were then passed to Cordelia as soon as Madison was strangled.
The reason I think all 3 witches could have been the Supreme at different parts is because of something Myrtle said to Cordelia…. something along the lines of “these powers were seeking a vessel among these young girls.”
This explains why all the girls had all of the powers( or almost all of them) while Fiona was slowly dying.
Just a theory… take it as you will…. I just refuse to accept that Ryan Murphy’s plot had as many holes as it did… so I am trying to make sense of what we were given!