I was reading the Fangraphs prospect chat with Mike Newman this evening and there was a question about Alvarez's struggles compared to what was thought of him at draft time. Newman stated that he had heard some bad things about Pirates' prospects and a change of scenery would do Alvarez good. Newman, to my knowledge, didn't elaborate on what bad things he has heard.

Has anyone heard about any concerns regarding the way the Pirates develop players, particularly hitters? Outside Alvarez and maybe Tony Sanchez, are there examples of players that obviously underperformed the concensus of their potential? I know the pitching development philosophy has been discussed quite a bit here, but I'm not sure the same can be said for position players. Of course, it could be just one dude's incorrect opinion, but does anyone know if there is more to this?