The key difference is that any talent scout could see the massive potential in Pogba, because of his unsual mental traits at his age. Wich is why Pogba at a younger age was allready at manchester united, at the same age, Berardi was a nobody in italian serie B.
Pogba in his first season in italy, last year, aged 19, became the hottest CM prospect since Pirlo, and ended the season with half this forum demanding Marchisio to be benched for him
Berardi in his first season in italy, this year, aged 19, became a player that was mostly playing average or very bad, and had a handfull of games in wich he absolutely stormed the place, scoring multiple goals
Pogba was ready at 19 for a top team. Berardi is not.
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Thats because you are posting on a forum, and arent employed as a talentscout at manchester united or juventus.
However, the very first game at juventus, it was quite clear why.