Well then, if he changed the fly to make it his own pattern, wouldnt HE be the originator of the PMS fly then? I read somewhere that there are no new fly patterns, only changing exisiting patterns for a tyers needs or wants. Hence, another "NEW" design is created. If you have been fishing a different fly(materials, hooks, etc) then it is a different fly.
Leonard came up with adding the pine squirrel, end of discussion, the PMS IS HIS DESIGN.