No doubt Ten Hag bears the brunt of the responsibility. I would say it takes a very strange person or even a madman to say that Mainoo was The Problem, don’t know if anyone has? Rather, all our players have several resources and several issues, and Ten Hag’s issue was that he couldn’t set us up in a way that over time got the most out of the players strengths and covered up most of their weaknesses. So any problem Mainoo had, due to positional inexperience for instance, became Uniteds problem because Ten Hag couldn’t set the team up and get them to play right.
For me, it seemed clear at the times we were most dough-nutty that Casemiro saw dangers that he couldn’t reach to snuff out and sometimes even gave up on, whereas Mainoo often would move around but taking wrong decisions and positions, and didn’t snuff dangers that he could have reached, sometimes putting Casemiro, McTominay or Amrabat in dire straits that could make them look worse. This was of course compounded by injuries, but I’m quite certain that a 28 year old Mainoo with due development would have helped that midfield to get opened up a bit less often than the 19 y.o. version could. All this in the end came under Ten Hag’s responsibility, and even if he managed to make us a lot less open in midfield this season, helping Casemiro par excellance to look better/less bad, it came all the while not scoring enough, still being able to collapse for parts of games, and looking unable to get the players to believe in it to the point where they looked lethargic or desperate. All this was Ten Hag’s plate to deal with, and he couldn’t, so he’s gone.
What remains is for instance a midfield with a combination of experience, technique, grit, but also with holes in terms of speed, creativity, were you always have to sacrifice one strength if you want to cover up another weakness. Van Nistelrooys solution was to make the team more cautious, more focussed on staying close, taking less risks in midfield. At home, against so-so opposition, we have been more effective (honeymoon joy effect?) and have seen less of the collapse periods than we have earlier in the season, but it hasn’t really looked any better to me in terms of playing strength. There are issues in balancing the squad still, I think. Now it’s Amorim’s job. Mainoo has some beautiful tools that can come of use already, but I think he also have some weaknesses to his game still that makes it less than 100% certain he will be first choice as often as he was under Ten Hag.