Hyperbole! Brando had 8 minutes of screen time and was a huge star.He was the lead about as much as Marlon Brando was the lead in Superman...
Skerrit takes the lead through the first segment of the movie and is in charge through the second. It's only in the third segment where Ripley takes the lead. She's on par with Dallas but I would not say it's a female led movie just because she happens to be alive at the end. They're equal.