Why did the Nationals move Tanner Roark? What does Tanner Rainey add to the bullpen? MLB.com's Tim McMaster (@MLB_McMaster) and Nationals reporter Jamal Collier (@JamalCollier) are in Las Vegas at the Winter Meetings to break down the club's trade with the Reds. They also discuss the latest with Bryce Harper as well as Anthony Rendon's future in Washington.