“That concept? (Essentially, yes...in the same verse you cited yourself: Matthew 28:18...”ALL authority has been given to me” ... So you think, Jesus no longer has ALL authority????)”
You made a distinction between ‘delegated + derived’ a distinction that appears nowhere in that passage, and certainly not elsewhere in scripture.
I’m curious as to where this particular concept arose? Jesus passed authority to St. Peter and the Apostles - the power to bind and loose, the power to forgive sins. I realize this is kryptonite to protestants because it challenges their believe that the individual has the primary authority. Jesus is whomever you make of him.
Derived authority allows people to exercise such authority...the power to bind and loose, the power to forgive sins.
It doesn't mean that the One from whom such authority is derived ever lost it.
Likewise, Paul twice references Jesus as THE Head of the Church.
No undivinated man is the head of the Church; Jesus never abdicated that role. He is STILL Head of the church.