It's just a shame Evra and Büttner left, because they would have been capable wing backs in this system. Depleted options on the left side, hence Young's deployment there (pleasant surprise).
May have even posed Büttner in a different light, compared to the "winger-turned-full-back" label that can't compete at this level well enough. This squad a year back with Van Gaal would have done significantly better, for sure.
Not really a shame Buttner left. LVG knew how he wanted to play and did not rate him in the slightest, hence he was sold. He wanted to keep Evra though.