Maybe I should rephrase and say its probably easier to drill less gifted players than more gifted ones?
You're right Pep's Barcelona had wonderful players who bought into what he wanted to do. However, the issues Pep had with Zlatan that you mentioned sort of illustrate the point I wanted to make: Naturally gifted players can find it difficult to accept being told to stick to a rigid plan. Also, Zlatan wasn't the only one.
Many of the players Pep inherited he moved out fairly rapidly, replacing them with La Masia graduates more inclined to respect him for his legendary status at Barca. Its not unusual for big players like Eto'o and Zlatan to think they know what gets the best out of them, and for them to push back against coaches they feel mismanage them. Its not that much of a leap to see why Zlatan thought the attitude of the Barca cantera products was childlike.
I don't disagree that ego is part of the equation. Still, the better a player is the more big headed he's likely to be. For instance, Messi does not get on with Luis Enrique. Messi took pretty much half a season to accept Lucho's decision to play him inside right, and that acceptance came only after his professional pride was bruised by losing the Ballon d'or to Ronaldo. Unsurprisingly as soon as Messi stopped resisting the new role Barcelona got into title chasing form. However, its not difficult to see what might have happened had he continued his battle with Lucho.
Players who aren't elite level are less likely to have these kind of battles with their managers. Its not impossible to drill a side of exceptional players, especially if you can capture their imaginations as Pep has successfully at Barcelona and Bayern. However, I think the task is considerably harder than it is getting into the heads of less extraordinarily talented players.
In many ways, the absolute authority of the manager at Old Trafford and the tactical naivety of the Premier League, makes Man Utd the perfect place for Van Gaal. In England, and especially at Man Utd, the manager's word is law. Plus, English players are (generally speaking) not taught to develop their own ideas on the game to the same extent as Dutchmen or Spaniards. With Holland, Barcelona and Bayern it all fell apart for Van Gaal, he had too many people above and below him questioning him. At United he won't get that. I'm sure he must feel sort of like he did 20 years ago back at Ajax.
I cannot believe
@matherto watched either Sunday's game or the 1-6 game.
City started well last Sunday but we were dominant from about the 12th minute, City did not cut through us at will. The City players used the direct ball to exploit our high line with the pace of Navas and Aguero. It worked a couple of times but as soon as we shook of the nerves and started playing they were gone.
As for the 1-6, we were much better in the first half and Balotelli scored against the run of play. Even after Evans's sending off the game was very tight until Fletcher scored. However, once we got it back to 1-3 Old Trafford began encouraging the players to chase a draw. In the last 10 minutes, desperate to try and rescue a point, the players threw caution to the wind, committed to attacking, and got hit on the counter repeatedly. It was a bit crazy, given we had 10 men against a very good City side, but we're Man Utd we don't go down without swinging.
If you want to point to a game where we were comprehensively dispatched by City, the 4-1 at their place last season would be it. We were never in the game.