Yeah, that sounds like real diva behaviour. He’s getting more recognition by the Deadpool movies then other creators by the MCU movies in general.

For example, I don’t think Walt Simonson and Greg Pak are even mentioned in the credits of Thor: Ragnarök, while the movie is an obvious amalgamation of Pak’s Planet Hulk and parts of Simonson’s Thor run. (Might be Pak is actually mentioned since he created the characters of Korg and Miek.)