You are repeating what you wrote above.  If there is no 'difference in degree of holiness' to which a ministerial priest is called----than we really don't need them.

In actuality, we have NOT ONE IOTA of proof that Jesus ordained anybody----not at the Last Supper, not at any other time.  The early Christian communities [33-100] in Palestine and where Paul, Barnabas and others established communities, SELECTED their own 'presbyters' for gathering around the table.

The ministerial roles were assumed by ordained deacons [women as well as men] and bishops.  There were not priests.  The role and place of the priests came some centuries later and only after a theology had been crafted to support their 'status'.