Prospects in Major League Baseball often progress at a routine pace until the player changes something -; a new pitch, a new arm angle, a change in approach at the plate, or a change in his swing. That's often the final thing a player does to make himself big league-ready.Many of the players highlighted this week have made a change, whether by choice or because of a change in environment, and it's provided a different perspective on their potential. We'll look at six hitters and six pitchers and...