I think Escobar is getting the start because 1) it's usually common to let everyone play fairly early in the season 2) he hit righties fairly well. As for Grossman, your other options are D. Santana, back-up catcher and Escobar/Polanco. Grossman can take a walk, if nothing else. Buxton is batting third because he's going to be the Twins best all-around hitter eventually, hopefully starting today. Mauer is batting fourth because Buxton is batting third.