It actually is a heck of a lot easier shooting from where I was there in shot #3, because you can see the pitcher wind up and throw, and you can see the ball going into the batter. The challenge, of course, it the depth of field to keep the batter, catcher, and ump in focus, and holding a 680mm lens steady. It is a LOT harder to get the ball when you are at first base shooting a tight crop and all you see in the frame is the batter.... for example, like this one...

What you want to do is watch the batter and look for tells that they are going to swing. With most batters, the tells will work whether they swing or not, as what they do in anticipation is the same. I've got some batters where I got the ball in front of them on most pitches, even if they didn't swing... and other batters that I couldn't ever get the ball in the shot. It is all timing, and takes practice and patience. And you can forget the 8.5 fps saving you... way to slow. Its a single shot venture if you want to get the ball in the shot.