Prospect rankings and evaluations are always a snapshot in time. They are always changing, and while most changes are subtle in the short-term, there is always the opportunity for big changes in a short period of time. Seeing sudden, rapid changes is only natural when you are dealing with young baseball players mostly in the 18-22 age range.
We follow the Pirates' farm system closely, seeing every player from the moment they enter the system, and watching them at every level along the way. For that reason, we get to see all of the changes being made, both of the subtle variety, and the bigger changes that alter a player's likely upside.
Every year, we use this information to determine who will be the next big breakout prospects. In the past, we have picked guys like Gregory Polanco, ...
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