It's apples and oranges to compare whether Ruth or Skylar is the greatest women's basketball player to graduate from ND. They're opposite ends of the spectrum as far as positions (guard, center). Skylar has the scoring statistics, but Ruth was the dominant player in the game that no one really had an answer for, and won a title and the national POY.
Right now, Muffett is feeling bad for Sky and Kaila. Three Final Fours, two title games, and they just fall short. When she steps back, she'll realize that as far as "the best ever," it's really a draw.