The He... is this, as John says and as Paul says, Jesus or the Father? John says that without Jesus nothing was created that has been created.
Paul basically says the same thing in Colossians 1:
13 [
t]For He rescued us from the [
u]domain of darkness, and transferred us to the kingdom of [
v]His beloved Son, 14 in whom we have redemption, the forgiveness of sins.
15 [
w]
He is the image of the invisible God, the firstborn of all creation. 16
For [x]by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—
all things have been created through Him and for Him. 17 He [
y]is before all things, and in Him all things [
z]hold together. 18 He is also head of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will come to have first place in everything. 19 For [
aa]it was the
Father’s good pleasure for all the [
ab]fullness to dwell in Him, 20 and through Him to reconcile all things to Himself, having made peace through the blood of His cross; through Him,
I say, whether things on earth or things in [
ac]heaven.
Verse 15 on is speaking about Jesus.
The we in Genesis 1:26 is the Godhead talking it out. Like royalty speaking in the plural because they speak not simply for themselves but also the state they are over. So if the Queen says, we are not amused, you better not be, since she said you are not, if you fall under her rule. God is one Being, but made of three PERSONS. Different word, different aspect, God is One. The three persons are coexisting and coeternal. It is as easy to understand as a lifelong vegan understands exactly what chicken tastes like. They don't and we don't. We have no shared experience that can explain God's existence.