So we begin the meat of the series in the hamburger metaphor of the article series. We had the top bun, the introduction and now we move down to the meat. When it comes to meat, catchers might be the best example (maybe first basemen). The Royals have at least two meaty catchers in the system (Vallot and Villoria) and they are probably the two best catchers.
Not that the Royals particularly need catchers in their system given their current catcher Salvador Perez, but a) depth is always good and b) Perez could lose his left arm at any given moment (Ned Yost would still play him for 155 games).