People are underrating player's footballing intelligence which is connected with player's "normal" intelligence.
Barca is a club where you need to have everything. And the way we play, attack, defend, play off the ball, apply pressure, we need extremely technically gifted players who also have a high (footballing) IQ (even though that one is again connected with a normal IQ).
Ok, not all of our players need to be rocket scientists, but most of our current players are extremely (footballing) smart players.
1. Messi is very smart in decisions, movement, build up+technically a GOAT
2. Xavi is the smartest footballer ever+technically extremely gifted also
3. Busi is extremely smart+with a good technique
4. Iniesta is very, very smart+with a world class technique
5. Pique is smart, Neymar and Suarez all have enough of footballing intelligence
-- Ronaldinho was smart, Etoo was smart, Larsson was smart
-- Edmilson was smart, Marquez was smart, VanBronckhorst was smart, Van Bommel was smart
On the other hand, who weren't the smartest guys around?
1. Alexis
2. Guily
3. Oleguer
4. Belletti in some moments
5. Tello
Today:
1. Alba isn't the brightest guy in the world
2. Mascherano also isn't the rocket scientist
Anyway, you see, all of players who aren't "smart enough for Barca's level" later can't cope too well with our passing style, with our fast and smart play/movement/build up etc, and they are usually "weak spots" in our attacking/intelligent gameplan.
And yes, you can have 1-2-3 players in the team who aren't as smart as Xavi (like Alba or Masch, who have some other strengths), but if you have "dummies" on CF or CM positions, then you won't be Barca, but Liverpool and some average team.
I know that this post may sound extremely offensive, but think about our golden players (from any era), all of them were extremely "footballing smart" with a world-class technique.
Now, Deulo: (pros and cons)
+ he has a nice technique
- his work ethic and attitude may be questionable
- but he just isn't "smart" enough for Barca
(he may improve slightly, but that isn't exactly a skill where you can improve as much as in other areas)
Adama:
+ good technique and physique
- horrible footballing IQ and decisions
Munir, on the other hand:
+ has nice footballing IQ, and this is why I personally believe more in him than in Deulo, Adama or Halil
- the question is whether his technique and other parts of his game will be good enough for him to succeed at Barca
= but again, he has something which Deulo, Adama and other guys don't have, and which is extremely important for succeeding in Barca
Samper:
+ the same story, this guy HAS very good footballing IQ
+ he has a nice technique and tactical knowledge
= we have to see whether that will be good enough for him to make it here
Halilovic, on the other hand:
+ the same as Adama, awesome technique
- low footballing IQ and poor decisions
- weak physique
- problematic attitude in the past
People are constantly looking "mostly" at player's technique, dribbles, goals and similar things.
But when you look deeper, you won't find too many "dummy" players that made it here, and that stayed for too long.
(Once again, my apologies for writing this kind of a post, but I don't know how to explain this point in a better way)