Theological Triage: What's of First Importance?

When it comes to theological triage, Paul calls the Gospel (the story of Jesus and its climactic moments) of first importance:

"For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures, and that he appeared to Cephas, then to the twelve."

I strongly suspect that Paul here defines what he means by "raised on the third day in accordance with the Scriptures" as he has done something similar with the cross in the beginning of the letter.

The letter then is shaped by the Gospel's form—what is of first importance.

This relativizes all the rest to second or lesser importance. And I think an argument could be made from the letter of 1 Corinthians that the Gospel narrative.

I should probably note that Paul's Gospel in 1 Corinthians follows the form of narration but the stuff of the Gospel story includes God, the Son, and the Spirit united Christ to his body, the church.

This incidentally explains why the earliest confessions had a triune shape since the Trinity is the Gospel when observed narratively.