Your reasoning does not explain the following passage from 1 Cor 15:22-28:
22 For as in Adam all die, so in Christ all will be made alive. 23 But each in turn: Christ, the firstfruits; then, when he comes, those who belong to him. 24 Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority and power. 25 For he must reign until he has put all his enemies under his feet. 26 The last enemy to be destroyed is death. 27 For he “has put everything under his feet.”[c] Now when it says that “everything” has been put under him, it is clear that this does not include God himself, who put everything under Christ. 28 When he has done this, then the Son himself will be made subject to him who put everything under him, so that God may be all in all.
It seems to me that Jesus is still teaching that the Father is greater.
Think in the sacrificial realm.
There is no true, God pleasing sacrifice without flesh and blood. OT times avoided eating the flesh and drinking the blood of to YAHWEH. Christ turned that on its head; now we eat the flesh and drink the blood of His true sacrifice.
While Christ was “in the flesh”, He was headed for a sacrifice that pleased His Father. His Father, God the Father, was pre-emminent while Jesus was in the flesh.
Accordingly, Jesus taught that “He who sent me” was above Him according to His flesh but equal according to His
Godhead (Athanasian Creed).