Offensively, I'm most interested where his batting average will sit. .210 is painful. .230 is tolerable. His 2013 season at .276 would be amazing. His BABIP numbers give a good indication of where he projects. MLB average BABIP is about .297-.300. The year he hit .276, his BABIP was .351. A very lucky year for him. The last three years where he hit, .222, .211, and .210, his BABIP was .294, .280, .297, respectively. A bit on the unlucky side, perhaps. Using these three years, and MLB average BABIP of .297, would say he projects to hit at .219. Again, I would be happy if he hits over .230 and hits over 10 homeruns. Regarding those homeruns, I looked at his batted balls chart against RHP from 2014-2016 on Fangraphs (cannot figure out how to paste chart here). 20 HR to right field. 2 to center field. 10 to left field. 6 of them to left field were really short (short porch in Houston). Those 6 would not be homeruns at Target Field. You might ask about deep flies to Tal's Hill in Houston that would be Target Field homeruns? It looks like Castro doesn't hit many deep fly ball to center. So, we might see a regression in homeruns this year.