If you read the criteria, you have to be listed as a leading actor. Yes I agree with you and why I stated that Marvel has heavily skewed the numbers.
I know Harrison Ford was the top grossing star for the 20th Century because of the Star Wars Trilogy and the Indiana Jones series.
He was good in Witness, The Fugitive, Air Force One, both Blade Runners, Clear and Present Danger, and Patriot Games.