Clearly Christ is not saying "simply that he had been commissioned from God above".
He is saying "I am from above"
You need to explain how ἐγὼ ἐκ τῶν ἄνω εἰμ translates to "my commission is from above". You're the one who's making it up.
NB: when I said that Jesus the human being is from above, of course I meant his incorporeal parts, the parts that are given by God to created human beings.
For the Lord God created Adam (out of) dust from the ground and breathed into his nostrils the breath of life.
So if the breath of life comes from God for every human in any event , then may be that provided a route for the Logos to come from God also, down to a human being. Perhaps the difficulties you are creating are because you don't have the right conception of what a human being consists of.