He was never picked as a RB under SAF, the pecknig order was Rafael > Jones/Smalling > Val/Fletcher. It started under Moyes as a trend to sub Rafael off and send Valencia back and almost every time we did that we both played worse going forward and also conceded many more chances. LvG has consistently picked Valencia at RB. I'm not very sure about his reading of defenders (I remember Badstuber, ironically, against Valencia, and Nani derstroying Lahm from the other side while a half-fit Rooney could keep their CBs off balance) For SAF and Moyes, Val > Nani; for LvG, Val > Rafael. For what it's worth, I think both decisions are wrong.