No, I counter your so called 'rule' number 122.3 as the royal sisters are equal if not Celestia being greater then Luna. Because if Luna was so powerful she would not have cast dark magic on herself/allowed a dark being to possess her to make herself stronger and become Nightmare Moon to defeat her sister is she was truly greater. That and who was it that threatened Equestria with an eternal night that would have killed Equestria with cold and ponies with hunger? How is that a sign of greatness?