7-8 new players is not impossible/improbable if we consider that some of them might be loaned out/exchanged, deployed as bench options, etc... We also have to factor in the possibility that more than one attacker might be sold, and 7-8 new players isn't such a stretch.
As for Marotta, I'm going to refrain from criticizing him until the mercato session is over, but I can't help but feel that he is bound to somehow/somewhat disappoint, and he clearly lacks something to ever be considered a true Juventino. I just sense/feel it in his words.