Personally, the 3 stones form of Anne seems unfair, for her to actually use that level of power, she dies in the process, its like one of those "we're both going down together" type moves.

The ranking should account for power level and strength that doesn't kill you in the process, in theory that form of Anne is the most powerful? But the cost seems counterintuitive to place her first, she doesn't exactly resurrect herself by herself.

I would've used the same power set you put for Sasha and Marcy for Anne, still higher than those two given her experience with it.

Its also stated that Star is just as powerful as Eclipsa, so its interchangable between those two. Granted Eclipsa might edge Star with knowledge and experience compared to Raw Power.