To be honest, I don’t place much weight on Opening Day rosters. It’s not as if it’s the roster the team carries the whole year. In fact, Opening Day rosters don’t stay intact past the first month. It’s even exceedingly common for the 25 man to change within a week. The Twins had a roster move within 5 days of the season opener last year. In 2014, there was a roster move on opening day. In 2013, there were several moves within 6 days. You get the point.
Injuries, paternity/bereavement, trying sneak players through waivers, calling up an extra reliever, etc.