She's such a good dancer and she's trained for a really long time? Why is she not a lead dancer?
I think it's because she sometimes over dances and when Twice was asked who in Twice is the slowest and fastest at learning choreography, they said that Momo is the fastest (one of the main dancers) and Jihyo is one of the slowest. And lead and main dancers (especially main dancers) have to able to learn the choreo quickly in order to teach the other members. Like Lisa is debated from being called the best female dancer in all of K-pop to having too many flaws (I think she's a really great dancer btw) regardless, she's lightning speed at learning dances.