Castro, 24, has not done much at all with the bat in the upper minors. Through 367 plate appearances this year at Double and Triple-A, he posted a .265/.283/.319 batting line with a pair of home runs and just nine walks.
Still, the Venezuelan could perhaps be a candidate to hold a 40-man spot through the winter if the Detroit organization feels he can contribute over time in a utility role. Castro has spent most of his time as a professional at second base, but has also lined up at short, third, and all three outfield positions.
As for Fulmer, the move doesn’t tell us anything new. It was already clear that he was done for the season when he underwent knee surgery yesterday.