Ok so let me ask you a question. Put aside the fact that they are Liverpool players for a moment, would you be happy to have Wijnaldum, Henderson and Milner as starters in the Manchester United first eleven? I ask that because by your description of their skills and talents you think that they are better than what we have. On my part, I am simply saying that we have players with similar limitations, the only difference is that Klopp has worked out how to get the best out of his 'donkeys', whilst Ole seems utterly clueless what to do about his.
Klopp's "donkeys", which I still think is disparaging, all fit into a gameplan. Actually, from the definition we've been working on, Mata isn't a donkey at all - he doesn't do a lot of work, he's not workmanlike. He can't put in a tackle, can't press. Additionally, the roles of Klopp's "donkeys" are not as creators. Therefore Lingard, for example, who does get through a lot of work, might work in a Liverpool 3 because he presses and runs and harries. But that's not his role at Man Utd, and he's not physically strong enough, and he doesn't have the leadership qualities which are obviously there in Henderson and Milner. Matic isn't a "donkey" either - his technique is very good, but he doesn't have the legs to get round the pitch and press, etc. So, what I'm saying is that the United players you've picked out, apart from Lingard, don't really fit the "donkey" tag. And Lingard doesn't play in the "donkey" position - he just performs to his ability, failing to provide goals or assists.
However, I would absolutely take any 2 of those 3 as the 2 in the 4-2-3-1 that Solskjaer wants to play, so Pogba could play further forward. They would cover the ground, put the tackles in, and control the midfield physically in a way that could give confidence to the defence, back up the strikers' press, and free up the attackers to attack, safe in the knowledge the ball can be won back and recycled quickly and accurately to them. While Wijnaldum continues to develop in confidence, the other two are now proven winners, leaders and standard setters.