4. Mark’s Dream

Hamill figured eventually we’d see something with a post-Return of the Jedi Luke, but he was sure they’re recast him with a younger actor. So, when they asked him to do it himself, he didn’t immediately jump on it. Then he realized it was a responsibility to the character he’s played for over 40 years.
Secretly though, Hamill said this specific reveal made sense to him, because Luke is one of the few people left in the galaxy who would even recognize Grogu’s species, having trained under Yoda