Actually I was thinking the other day that arguably the "hottest" / most relevant actor to ever appear in a Star Wars movie is Emilia Clarke in Solo as Game of Thrones was ending.
I do think Ryan Gosling is the maybe most relevant actor ever to star in a Star Wars movie? Liam Neeson and Samuel L were doing kind of whatever movies a few years before Episode 1 it looks to me? Liam Neeson has Schindler's List and Jackson has Pulp Fiction, but those are both further back from Episode 1 than Barbie is to Starfighter. I don't think either has a Project Hail Mary -tier hit right before Star Wars.
When we look back on careers, it might be that Liam Neeson or Sam Jackson are "bigger" actors than Gosling. However, I agree that Gosling is a bigger / more relevant star than anyone I can think of at the time of the movie.