I still think that Paul was creating theology about Jesus from his own ideas over Jesus's words and the scripture. What makes Paul so convincing is that he makes Christ the centerpiece of Christianity, but if you go back to the previous verse to what you quoted, he wrote this:
"According to the grace of God which was given to me, like a wise master builder I laid a foundation, and another is building on it. But each man must be careful how he builds on it."
— 1 Corinthians 3:10
Then, in the next verse, which you quoted, he says Jesus is that foundation. But clearly Paul takes credit for laying the foundation.
Well which is greater: the foundation, or the architect of the foundation?
Clearly Paul put himself before Jesus.
"According to the grace of God which was given to me, like a wise master builder I laid a foundation, and another is building on it. But each man must be careful how he builds on it."
— 1 Corinthians 3:10
Then, in the next verse, which you quoted, he says Jesus is that foundation. But clearly Paul takes credit for laying the foundation.
Well which is greater: the foundation, or the architect of the foundation?
Clearly Paul put himself before Jesus.
4 For when one says, “I follow Paul,” and another, “I follow Apollos,” are you not mere human beings?
5 What, after all, is Apollos? And what is Paul? Only servants, through whom you came to believe—as the Lord has assigned to each his task. 6 I planted the seed, Apollos watered it, but God has been making it grow.
7 So neither the one who plants nor the one who waters is anything, but only God,
8 The one who plants and the one who waters have one purpose, and they will each be rewarded according to their own labor. 9 For we are co-workers in God’s service; you are God’s field, God’s building.
I am getting worn down by so many people uniting against me here. I can't address every point made.