#3 Seth's intensity and fiery disposition better suit a heel role
When you think babyface wrestlers, you often think of men and women who are at the least somewhat personable.
It just makes sense that someone who can connect with the fans and garner their sympathy makes a good babyface wrestler. After all, the good guys in film and fiction, while flawed, are often still the kind of people fans would want to sit down and have a beer with.
Charlotte Flair to return and wrestle a CURRENT CHAMPION?
It's hard to imagine sitting down with the intense, usually angry Seth Rollins for a beer or any other type of beverage, for that matter. He's got the type of personality during his performances that just screams bad guy. Seth snarls, Seth yells, and Seth attacks people when he doesn't get his way.
These are the actions of a heel, not a babyface.