Thing is Marlon is very talented. People joke but he could pull off Smoke/Stack if he wanted. His problem is he tries TOO HARD when it comes to comedy.
That's probably little brother syndrome of always trying to live up or surpass an incredibly talented family.
Shawn's humor looks like its going to work in this movie. However, Marlon's forced comedy in his 50s is going to go one of two ways.Hoping for the best.
Fact of the matter is that Marlon as a comic actor just works better paired with Shawn to balance him out.
As a dramatic actor he’s great solo.