The Spirit of the Son was there at the time of creation. That Spirit was the Spirit Oneness cry (as the only true God) ABBA Father. Gal. 4:6 The Bible and Paul said The Son was a man Hebrews 10;12 and 1 Tim. 2:5. the man is the mediator to God. God is not the mediator to God.
Galatians 4:6 
And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father. The Son possessed the Spirit by no measure.John 3:34 he was not possessed.

Phillipians 2:5-6 ,  Truth tellers know who the Son is according to his divinity. Jesus is both God and man.