Now if shleimut  completeness  had been attainable through the Kehunah of Levy--for under it came the Mattan Torah  giving of the Torah  to the Am Berit--what further need would there have been to speak of another Kohen arising AL DIVRATI MALKI-TZEDEK  "according to the order of Malki-Tzedek" --Tehillim 110:4  rather than "al divrati Aharon"?