kpop fandoms tend to put ballet dancers on a pedestal but in reality there are usually other members in their groups who excel more at idol dancing. after all fluidity / flexibility isn’t everything there is to dance, and there are habits ingrained into ballet dancers that might not be suitable for the type of choreos they need to execute as idols. aside from kazuha, twice’s mina is another example that comes to mind where the ballerina isn’t really the best dancer in their group
Actually Mina is really quite good but is constantly overshadowed by momo. Mina has good form + precise execution but she lacks the strength (which people think Jihyo is better because she dances like end of the world). After years of ballets give you more flexibility and increase fluidity + also the accuracy in exectution, but the elegant nature of ballet tends to make them less energetic as compared to others but technique wise they're still above average.
I would still put Mina in top3 of Twice. #2 or #3 between Jihyo and Mina.