I would still rather get Turan than Pogba, if Turan can play Cm in Lucho's system.
Turan is proven in La liga, he played more than 1 good Season in his career (Pogba).
28 and soon 29 is not THAT old.
He is actually only 5 Months older than Messi, equally as old as Suarez and 1 year older than Rakitic.
On one hand people could say that we have too many older players, and that it could turn out to be a problem.
But on the other hand, we could say that we have a core of the team on their prime (28+ years), in Messi, Suarez, Rakitic, Turan, Busi etc.
If we assume that Messi will have only 3-4 more Seasons in a god-mode (he will be 32 and 33 years old in the 5th Season from now on), we have 2 options:
1) buy someone younger like Pogba who will or will not fit in and help Messi to win more CLs in his final career's years
2) buy someone proven both in La liga and CL in his prime years, who will more or less, SURELY fit from the day 1 and who has higher chances to bring glory to Messi's final 4 years in Barca
Yes, on the other hand, some people may ask:
-- but what we will do in 4 years when both Messi, Suarez, Turan, and other players will be gone?
= true, we will have problems then
But then we will have extraordinary problems because we will lose Messi, and we will NEVER be the same team as we are now.
And none player in the world, no matter if his name is Neymar, Pogba or some other new superstar will lift us to the current heights (as a goat Messi).
So, without Messi, we will be just a regular team, full of humans/mortals, and we will suffer the same as Real, Chelsea and all other "regular" teams who don't have Messi.
So, imo, let's try to win at least 1-2 CLs in Messi's final 4 years with proven players, than risking with young and too expensive players (like Pogba).
Buying someone older and proven is basically going ALL IN on CL trophies for the next 4 years.
When Messi will be gone, we will either way cry for the current days when we were by far the best team in the world.
That will more or less never happen again.
We will be among the best 3-4-5 teams, as always, but never as superior as in the last 8-10 years.
So, if true, if he can play Cm or Amc in Lucho's system, Turan has my vote.