Did the New Testament Letters Ever Influence the Gospels?

Many scholars say that certainly some of the letters predate the gospels. The crucial issues at work in the new testament letters are all related to what we just looked at. And so huge focus on circumcision and food diets, and calendars that people are living by. Thir's like a major issue: Do you obey the laws of the tora or do you obey them? There is jesus vs sabbath; there is jesu vs sabbatha. What i think gives us leverage over these debates is that the gospels as compositions aren't just written in light of the controversies happening in early church.