Is it that time again?
There's little in cinema that isnt a collaboration.
It is increadibly difficult to decide what was the bit that really made the scene. Even some clear things are muddier than it may appear. Take a line of improv (Say Han Solo's "I know") while the actor takes a big chunk of credit, the director and probably the writer, and even the other actors likely influenced the actors feel for the charecter and moment that lead to it. Even once you've apportioned who's responsible for coming up with said line, it working is again a function of other things, the other actors reactions, the editors cuts,the cinematographers framing and lighting (among a ton of other choices there usually made in consultation with the director, gaffer etc), the work of the makeup artist and wardrobe department.