The Pirates made several trades this year that sent out some of their outfield prospects. They sent Harold Ramirez away in the Francisco Liriano trade. They sent Tito Polo to the Yankees in the Ivan Nova deal. And in the off-season they traded Keon Broxton as part of the Jason Rogers deal.
Trading from the outfield is definitely trading from a strength for the Pirates. In normal years, the trio of Andrew McCutchen, Starling Marte, and Gregory Polanco would be the best outfield in baseball. Even this year, that outfield ranks second in the NL in WAR, although Matt Joyce certainly helps make up for McCutchen’s struggles.