He has to!!!!!!!
He is the pride Lands’s champion
Kion's also much braver than his father, and Kion is more willing to confess. Kion has the strengths of a real hero he just hasn't been offered the clearest scenes that would make it clear the youngest kids who watch this show. For the safety of both Outlands and Pridelands as you've both said Scar must be defeated.
I know Kion will beat him!
All fiction is rigged to have a happy ending. I had to remind me of that during the climax of Toy Story 3.
That’s cool