The best player of the team played in his best position and that's Griezmann. The problem for Pogba is that he hasn't outperformed his competition, has an advanced #8 or on the left side of a flat midfield three.
To make it clear, I said before the competition that France best formation is the 4312, that's why I disagreed with Deschamps selection and like
@BBRBB said numerous times (I think that it was BBRBB) Deschamps discriminates the Ligue 1, that's why he didn't used that formation.
Our best team is that one:
-----Benzema-Griezmann
----------Ben Arfa--------
Pogba----Diarra---Kanté
Or
-----Lacazette-Griezmann
-----------Ben Arfa
Matuidi---Mendy---Kanté
But here is the trick, Pogba has never outperformed Matuidi, you can't really justify Pogba over Matuidi if you concentrate on actual performances, Pogba's potential or perceiced talent is completely irrelevant, he needs to prove his worth on the field with the blue jersey.
Pogba is great with Juventus, he has mastered their system but he is a tactical nightmare outside of it, he doesn't really think for himself yet, he hasn't matured yet. And that's not a criticism, it will come, he is in the same situation than Kroos at the same age.