Regarding the weakness in the midfield, it is actually not too bad from my point of view. But in the defense line that is always in the spotlight of everyone who always says the defense line needs a strong wall. The attack line and the midfield are no problem for me and are still quite productive always helping the attack line to score, but the defense line seems unprepared when the opponent starts to attack. Watching every Man United match makes me anxious.
Better to put Onana on the bench and let Bayindir to play, he's always become goalkeeper for Manchester United while Ten Hag already try to rotate and change the players. But still, the performance is still same, as we know only Onana that has never get changed by Ten Hag.