We badly need a dynamic midfielder and our only options are Sturaro (who cannot do anything other than make runs/tackle) and Lemina (who Allegri clearly does not rate). Rincon looked far better on the ball than Sturaro when I have seen him.
Everybody knows we are light in midfield and he gives us an extra player, who can tackle and is available for the CL.
But where are we going to be with him in 18 months? Is he really good enough for Juve in the long term given his age and the fact that we should aspire for a better midfield than we have now?
I can see him being a player we will want to get rid of in the future and struggle to do so.
I can see an argument that if we want Gagliardini or Kessie in the long term and this signing is as a backup, maybe we should just spend a bit more to get them now than spend 9m on someone who is likely to be surplus in 18 months.
Maybe Marotta thinks it is worth shelling out 9m for a stop gap.