I understand what you are saying but problem is no team can have 22 (or even let's say 15) world class players at the same time. First, it's not financially affordable and second, you can't keep them all happy. So a dropoff in quality when you go from your best XI to the bench is expected from any team in the world, including Barça.
I tend to agree, but it is NOT needed to have 15-22 world class players simultaneously.
The coach is there for a certain reason, even if he himself will never understand the game like some world class players do, which seems to be a problem.
The method is ancient and simple once again, namely that he might experiment but in that case he should secretly and even unconsciously give up one of the aims, be it the Liga, or the cup. Then he may experiment, but the well lubricated system will definitely suffer.
The system suffers:
- if there's no right back who is outstanding or at least good in defense
- if the world classes have to play differently due to the experimentation flow
- if injuries force him but he decides to experiment instead of substituting
- and obviously if the key players are out of form
Some of the world classes will equally suffer, because it is them who theoretically need to carry the excess weight on their shoulders. But they cannot always do it if out of form + the known system is turned upside down.
World classes aren't machines, all of them have occasional bad periods. It's natural. But the coach is there to know what to do.
For a world class being out of form is mainly due to psychological reasons, often fatigue plays the role of devil, but it's the coach who should know what's happening to him, because he is to judge the motivation and physical state of the guy. He can see all that in the greenroom or during practices. If he doesn't, then he does something wrong.
And there comes the mythical question of luck, which also plays a big role obviously.
He (the coach) shouldn't be superstitious but at the same time shouldn't be predictable either. Like Lucho brought in Arda, perhaps likes him to some extent, but he should have known from his own pragmatic results that substituting him to different positions will not result wonders. But he does that and when Arda scores a hattrick, he brings his self-complacence and says: I told you, he is great, he just needs time and chances to show it up! No, he is NOT great, but can have nice days or moments.
And that's the luck-factor in play.
Because the best coach should NOT allow the circumstances, luck or the will of the deathless Gods
to lead him, the good coach (or generalissimo) must influence the game himself by his carefully thought-out and timely decisions.
The bad coach gives hope that the talented but hardly above average player of his will fish out a good performance somehow, but if this hope is his best weapon, it means he is not in command...
I'd also argue that Alba is world class as he's top 5 LB IMO you mentioned are still here and will most likely stay at least for the next 2-3 years except maybe Mascherano whose possible replacement Umtiti has shown the most from our new signings so far and should be able to fully take over his role whenever El Jefecito leaves or even before that. If Umtiti continues with his development he could also be considered as world class in 2-3 years as well.
I marked Alba as National Class and not WC but I agree with you.
Umtiti is a good example and he is the only one so far.
But how about Arda? Will he take Neymar's place? Can he be amalgamated into the team at 30? What does he want to do with him on the long run? Nothing... just play him occasionally and HOPE he has a nice day. That's the dependence on
mere luck...
Same with Alcacer. Deep inside the coach is deadly dissatisfied with him but openly he praises his good passes (2 out of 16) and his single assist so far. Childish... Now this is bad coaching, trying to persuade the public that the guy only needs time and trust, whereas he knows as well as we do that he is a hopeless case in Barca. Not his style and not his ground, even if a Messi plays beside him. But he will never ever understand Messi, simply because he belongs to a different species or class.
Neymar will always understand Messi because he is the same class, so does Suarez, who always understands him, just occasionally too nervous, heavy and clumsy to do what needs to be done.