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While the Astros have some good options at catcher in the minors, Castro is the only one with major league experience after Max Stassi got injured creating an opening at backup catcher. Castro is coming off a down season and is in his final year of team control entering the 2016 season.
The Astros will lean on Castro to do most of the catching, but of the potential candidates right now, it has to be the more all-around player in Heineman. Roberto Pena is more of a defensive catcher, but both catchers did hit 13 home runs in their one season at High-A Lancaster.
There is a more likely option, which the Astros could trade Dan Straily and a prospect for a backup catcher such as Bryan Holaday or A.J. Jimenez. Straily is out of options and would have to clear waivers to be sent to the minors. He has zero shot to make this team, the only reason he started yesterday and pitched four no-hit innings was to showcase him. Both Holaday and Jimenez are batting over .400 this spring so that offensive power behind Castro would be welcome.