It depends a lot on what you count, if we count talents only then I'd give it to Sonitkova.
If we count star quality only then it's Lipnitkaya.
But if we count the longevity on the top level of ladies, then it's Slutkaya. Being held up or not, the fact is she was the face of Russian skating for a very long time. Her contribution isn't just some poorly choreographed programs and her bad posture.