Marotta hasn't dropped a lot of money on anyone this summer bar Morata.
All the others are loans with options.
Sturaro, just like others before him, are investments. For financial and football related purposes. Paratici and Marotta think he has promise.
Juventus has a lot of kids that we can watch this upcoming season in Serie A. Leali (Cesena), Magnusson (Cesena), Rugani (Empoli), Berardi (Sassuolo), Zaza* (Sassuolo), Gabbiadini (Sampdoria), Spinazzola (Atalanta)
Hopefully a couple of those shine like Berardi did last season.