Honestly, he needs to learn on the job. He's young and if he can get through this, he'll be a franchise corner infielder here for a long time.
It's not always about what's best for the team at this very second.
Garin Cecchini is too far away to be called up. Doubt they bring up Xander. I think they let WMB work it out. It's the right thing to do for his development.