United fans have to accept the fact that due to OGS's lack of integration of our bench players, we have a first XI whose form is of top team in the EPL, the bench that seems to be of Fulham level. Subbing one of the players into games is similar to bringing Lookman into the squad. If I were Unai Emery, I will not play vdB over Parejo, Bailly over Pau Torres based on how they have been playing over the past year. The current form of vdB, Bailly, Tuanzebe, Telles and Williams won't even get into the first XI of Aston Villa, let alone Villarreal. My co-worker came and asked me a few weeks, "United will surely win, right?" And I said, "if our first XI can't finish them, we are done."
If it were true that our players would have walked into the Villarreal squad, then Arsenal's Kolasinac and Mustafi would not have gone to Schalke. These three have stopped showing top Bundesliga form for 3~4 years , and they have fallen to the level of a bottom Bundesliga player, which is why they are today only good enough for a struggling Schalke, not Union Berlin.
I am not abstaining OGS of responsibilities over the defeat - he has to take some responsibilities for the failed transfers and why we are buying players and not playing them at all.