lol this coach knows as much as nothing. THere are study's that have proved that a weighted bat slows down your bat speed anddoesn't increase it.
Also hips are big but you should be doing alot of core but not with a bat and swinging. I want to confrount him and teach.
For your size that means nothing if you know how to use your body then you don't need to get big and getting big would hurt your pitching.