Hopefully you can teach him and we can improve our results. Since he's done that we're all been going downhill, eventually we might run out of luck.
And we don't play a 4-3-1-2 with a proper AM, ffs, you make it sound like if we are Ancelotti's Milan and Allegri wants Vidal to be a Kaka.

And Pereyra would not be able to do that job too, you don't have a clear idea about the player if you think so.
You've been posting this $#@! with Pereyra as a starter everywhere, like if this is something obvious that just a clown wouldn't see, while Roberto, that I appreciate, has nothing better than our top 4 midfielders. Not a great dribbler, he didn't beat his man once against Toro in the last minutes in the right flank today and he was fresh. His passing is better than Vidal? Nah. His timing? Nah. His drive and tackling? No. We're often shaped as a 4-2-2-2/4-1-3-2 and he's not better than Vidal or Pogba in those position. Vidal has had his job today, he was mobile and smart as requested by this system, he interchanged his position with Marchisio to let him go in sometimes, with a tactical acume that I'm not sure Pereyra would have had. Vidal was one of the best in the pitch today IMO, even if the overall performance of the team wasn't high and they were all tired, Arturo too, and showed it. But Pereyra played today a full half hour and didn't do nothing to deserve a safe starting spot as you claim.
Then you say Allegro is doing weird (???) things to play all our 4 CMs. First of all, all of them are world class players that would play pretty much everywhere, don't give a $#@! about the hype or Serie A statements. Then in 5 matches with the new system, they played just in 3 of them, and there was even the international break in the middle. Pereyra even started an important match like Lazio away, when Vidal was available.
Let's hope the guy gets a clue soon, however, he can't see such obvious things... If he did whatever he had too we'd have played in a good way perhaps, instead of scraping in ugly matches and slow football with Vidal AM.