As it turns out the “deleted scene” was really more of an outtake, and it was never actually meant to be in the film.
How did Yondu end up in the latest Thor movie?
As to why Michael Rooker would get transformed into Yondu just for fun, the Guardians of the Galaxy Vol. 2, director revealed he was in makeup already for something else entirely.
Fans are used to seeing various characters in the Marvel Cinematic Universe appear together, but if you’ve already picked up a digital copy of Thor Ragnarok, you may have seen a crossover that was quite unexpected, Yondu on Asgard.