What makes the Gospel writer's quotes of what Jesus said of any relevance??? You think they are telling the truth more than Paul???
Peter never said the Gospels were scripture but he did say what Paul wrote was scripture...
But maybe then Peter didn't really exist...
Paul is first mentioned in the bible in the book of Acts.
Christ had already ascended into heaven and had sent the Holy Spirit on Pentecost.
Paul/Saul did not walk with Jesus.