I think pdjt must certainly be able to find better advisors than the old bigot peanut farmer. Like, about 7 billion better advisors.
I think it is a stage act by PDJT. Carter was a bad president but personally decent guy (Or is seen as such) Hobnobbing Jimmy helps trump with the perception that he is a decent guy. AND it is a passive snub to The PIAPS, Nancy Piglouse and the current horde of democrats. Trump is saying, ever so subtly, “Jimmy was awful, but he’s better than you guys!”