As they prepped the roster and the lineup for Alex Reyes' return to the rotation for the first time since the playoff push of 2016, the Cardinals had some additional considerations.
An injury to Yadier Molina had briefly left them with two healthy catchers on the 40-man roster, and when Carson Kelly went on the disabled list, a move just to have cover was necessary. They wanted to avoid that again, and so they're keeping Steve Baron on the 40-man roster.
Dominic Leone is in the midst of recovering from nerve damage in his pitching arm -- and the Cardinals have described his recovery as "long term" and "uncertain" because the damage done to the nerve and resulting trouble with his biceps muscle is similar to the injury Chris Carpenter had years ago.