Forget about Puig being fit for koemans system. Let's say he is not and that why he doesn't count on him. Ok thus far.
How the hell is Alena good for that system? Puig is a level above Alena at everything. So it really doesn't make sense if Puig goes but Alena stays.
Bad decision in my opinion.
Puig moves well and passes well.
He is not physical, can't defend, can't score.
Alena is less technical, more physical, can defend better, can score.
Alena is more of a goalscoring threat as one of 4 attackers in 4231.
Puig scored 2 goals in Barca B career.
Alena scored 18.
I know, but but but: Puig's job is not to score.
Well, in Koeman's 4231, 2 pivots are more like workhorses/defenders and 4 attackers are creative-scorers.
There is no room for Puig's type in 4231.
He is Iniesta's type for 433, the most advanced Cm, who don't have to defend and who connects midfield and attack.
In 4231, he can't play a defensive double pivot, lol.
And he is too sterile for being an attacker.
His skills are "between" defense and midfield, something which 4231 don't need that much.
And as others have said, Coutinho is a Cam, who just won a CL.
Messi is a Cam.
Griezz, a world cup winner.
Plus, Pedri whom all coaches rate higher than Puig.
He is way younger, way more 1st division exerience, more of an all rounder and more physical.
You guys act as if we got rid of prime Iniesta and not a 21 years old guy with weak physique who played 5 senior matches in his life.
I am not sure that he will be a starter in any midtable La liga club, the same as Samper, Alena and Halilovic before him.