Answer: by optioning (or trading) O'Hearn.
We have mostly been treating O'Hearn as a lock. But if Mountcastle can be more or less full time 1B, Stowers and Cowser can both make it. Westburg, Santander, and Urias can play some 1B when needed. O'Hearn would still be a phone call away in AAA.
O'Hearn had a great year for us and a fine spring, but is he likely to repeat? Even if he does, Stowers could be better. Could O'Hearn be more vulnerable than we think?
RHP lineup would be Holliday 2B, Adley C, Gunnar SS, Santander RF, Mountcastle 1B, Mullins RF, Stowers DH, Urias 3B with bench of Mateo, McCann, Westburg, Hays.