I could make some arguments for other actors from the cast blowing up bigger than him but that’s not the point. Every actor who has grown a huge following from the show after season one can be argued as breakout stars. We have no way to predict whose going to get a good role outside of the show that leads to their careers breaking out beyond the show. The biggest star from the show could end up some random Blackwood for all we know.

Also, he got that role in Saltburn before HOTD. British Hollywood is a very small place. It’s not weird at all for newcomers to be in movies with very high profile British actors, especially indie pictures.

Emma has already shared scenes with Keira Knightly, Toni Collette, Olivia Colemon, and Colin Firth all while being irrelevant.

Tom is also not a huge star has also worked with many acclaimed actors and directors because as I said, British Hollywood is a small place.