It's similar also to how
2 Peter goes way out of its way to establish its legitimacy as a work by Peter's hand....i.e. "I'm Apostle Peter, that's
Symeon Peter, to you...and
I was the one on the "holy mountain" with Jesus during the
Transfiguration, you might recall that from the
Gospel of Mark, I saw it with my own eyes and I heard the voice from heaven with my own ears, and
I was the one that Jesus warned would die a martyr's death as you might recall from reading the
Gospel of John, and by the way this is my
second letter to you in case you might have read
1 Peter, and in case you have read the letters of Paul, you might take care not to misunderstand them, in fact you should remember and keep in mind what all the
apostles used to say when they were alive...oops, I forgot I was an apostle. Anyway....."