It would be downright negligent to conclude that the NT writers are somehow contradicting the OT tenet that God is the lone Creator. For example, from Moses to the prophets to Jesus and his Apostles in the NT, God alone, without any “Principal Agent,” i.e., anyone else, created everything.

Job 9.8a “He alone made the skies.”

Isaiah 44:24 “I am YHWH doing all things, Stretching out the heavens by Myself, Spreading out the earth [some mss. even add] who was with Me?“

In the NT at least 4 times Jesus says someone else alone created.

Matt 19.4 “Haven’t you read,” [referring to Gen 1.27] “that He who created them in the beginning made them male and female,” [NOTE Jesus said He not We]!

In Acts 17:24 Paul explains to the Greeks that the “Unknown God” is in fact “the God Who made the world & all things in it, since He is Lord of heaven and earth.”

This is but a sampling of the over 100 explicit statements throughout both Testaments that witness to the lone creator God the Father with no “principal agent.” And many Trinitarian commentaries understand this simple fact.

Pulpit Commentary on Isa 44.24: “God did not delegate the creation of the heaven and the earth to an inferior spirit….He did not even call in the co-operation of a helper. Singly and solely by his own power he created all things.

The Moody Bible Commentary, Isa 44.24: “God’s acts of creation were comprehensive, meaning that no other god created anything. God created alone. He needed no help in stretching out the heavens or spreading out the earth. He brought it about by His power alone. No god stood before God, against God, or with God in the formation of the world.”

So whenever the NT says God the Father created all things in, or through His Son, it should be understood through the biblical worldview. For example, Paul says in Colossians 1:16:

“For in him [Jesus] all things in heaven and on earth were created,” i.e., by God.

And again in v. 17 “all things have been created through him and for him.” [NOTE Paul doesn’t say all things were created by (hypo) Jesus, which would mean he was an agent of creation. Paul uses the Greek preposition EN, I.e., in him.] According to noted Trinitarian scholars like Dr. James Dunn and Nigel Turner the Greek EN here is causal, i.e., because of (Turner, A Grammar of NT Greek, Vol. 3, p. 253); with him in intention (Christology in the Making, p. 190). 

Again, the point is simply that Jesus was the purpose for the whole of Creation. Hay in his Abingdon NT Commentary on Colossians, p. 57: “Jewish tradition had previously said that God created the universe through his wisdom (Prov 8:22-31; Wis 7:17-24; 9:9) or word [see Philo]. God created the world ‘for’ the Son, indicative of a divine eschatological purpose…Rabbi Jochanan [3rd AD] said the world was created ‘for the sake of the Messiah’ (b. Sanh. 98b).”

So, it would be strange for God to have said: I have created all things for myself!