I'd agree that the Organization is likely handing out rankings however they feel like (Which I stil suspect is based at least partially on base Yoki). How else would Ophelia, who's technique wasn't widely known be #4? Or Raphela who, according to Irene is much stronger than a number 5 should be, be #5. And Jeane who's technique has no practical application except for fighting tough Awakened Beings and even then only with a support group to give her time to prepare it.