Wtf is this shit? Are you being fucking serious now? We practically got Pogba on a free. He was a low risk high reward scenario. Moreover, had Pogba failed, we would've still been able to sell him for a few million (at a profit) seeing as he is still very young.
Pereyra is still young (not as young as Pogs obviously), but he isn't a low risk high reward scenario. We got him on a loan with option (which I'm pretty sure will turn into an obligation, as Marotta stated it himself) that might end up costing us 17-18 million Euros.
Hence, Pogba didn't need to be a proven acquisition at the time of purchase, considering we got him for practically nothing; that is, unless you want to buy proven players for free. In that case, may Allah be with you.