With players like Sergio Agüero, Ángel Di María, Gonzalo Higuaín, Paulo Dybala, Cristian Pavón, Maximiliano Meza and Ever Banega, Argentina should be terrorizing opponents on the attack.
Their inability to defend has been exposed, and they lack presence in midfield, with the latter contributing to disjointed play in the final third.
When Kun was asked about this by the press, he momentarily appeared mortified and hit back at Sampaoli, saying: "Let him say what he wants".
"There are many myths about the team and about this generation", he said.
He celebrated his birthday along with his teammates who are in Russian Federation.
And those who say he does not perform for his country like he does for his club are wrong.
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Sampaoli has previously claimed that Dybala is unable to play with Messi - but Dybala thinks they can make it work.
Those three will play a crucial role with their quality and experience, but Sampaoli must find a system that works.
Argentina has only one point from two matches after drawing 1-1 with Iceland and recording an embarrassing 0-3 loss to Croatia. He switched formations - to a shape that didn't suit Lionel Messi - and his personnel.
"Leo has played as well as he could, but it is hard to solve the problems of your peers - and I should know".
The Barcelona forward missed a penalty against Iceland and has looked short of confidence.
The players can listen to the manager - and they should also be able to express themselves about what they do not like from him.