Read a good breakdown of Roby's play in the Wisconsin game and found some pretty interesting points
-He was the sole outside contain for the jet sweep, while playing man covereage. So he had to play the run first, while also covering UW's best receiver. This is why he was able to get beat on PA double moves. He had to play the first 7 yards or so of the route as zone, would jump the PA, and Abracadabra would be gone.
-The coverage responsibilities for Boundry vs Field are very different in zone. He was caught playing the boundry coverage responsibilities a few times where he got beat, so he didn't have the proper help. It's not known if Roby was playing the wrong coverage, or if the other defender's couldn't remember to switch responsibility.