As a coach, learning to teach the turn efficiently and properly will make each player you coach better. No matter their current skill set or a swing style, introducing and stressing correct rotational mechanics will improve your hitters. Almost always their exit speeds will increase almost instantly and how far they hit the ball will go up as well.
Don't be afraid to show your nine-hole hitter how to turn, who knows, maybe your nine-hole hitter becomes your new leadoff. Having more good hitters is never a problem! I will say that writing the lineup can get tricky with six three-hole quality hitters on the team. But then again, those are the types of decisions every coach wants!