The fence drill ingrains into the hitter to actually keep the bat head from release until the hands have almost gone past the contact area. What most good/strong major league hitters do and why they are such powerful hitters is they are able to get the bat head going much quicker in their swing than average hitters thus creating incredible bat speed. They do not lagg the bathead behind as the fence drill instructs. They are able to release the bat head almost in front of the back hip. what this does is square the bat head to the pitch and levels the swing off to the plane of the pitch. If your player is popping up to the right hand side or consistently late on pitches and you have been using the fence drill, it could be the culprit. He is not squaring the bathead to the pich and is lagging the bathead behind his hands. These players often look like thier swing is incredibly fast but lacks power. Its because the bathead is not sqauring and extension is not occuring until after the uter the ball is past the optimal contact point.
Get a good pitch to hit!!!!