Based on Brad's comments about waiting to fill the 15th spit, I wonder if it foreshadows another last week of the season conversion of a two-way contract.
I absolutely think this is the plan barring a long-term injury in the next week that would create an opening in the rotation, or someone unexpected being bought out (and that player making less than the MLE this year so we would be allowed to sign him).
Peterson has been giving us decent minutes when called upon, so I do expect him added to the 15-man in April, on a minimum with a non-guaranteed second year that we decline and then re-sign him to a 3-year deal, as we did with Hauser and Queta.