Washington Nationals’ GM Mike Rizzo added pitching depth via the waiver wire on Monday, claiming right-handed starter Rogelio Armenteros from the Arizona Diamondbacks, just a few short weeks after the D-backs claimed him off waivers from the Houston Astros. It’s the latest in a series of low-profile moves Rizzo and Co. in the front office in D.C. have made to start the offseason building. Is there a big move coming this winter, or will the architect of the organization continue with the under-the-radar sort of deals we’ve seen thus far in this Hot Stove season?