That's what Marrota gets big bucks to figure out. Majority of top teams are overloaded with attacking midfielders or creative CMs, we have only 1 real one for the starters. That's why we more then any team badly need attackers like Dybala and Tevez, and dynamic ones like Morata to work with them, players who create for themselves.
What's more worrying for me is we compensated for the lack of that (besides having genius Pirlo) by being much more aggressive and completely dominating hard working type of midfielders. Specifically one in Vidal (but overall machines in the team like Licht, Asa, Marchisio etc), if you don't have the technique and creativity overload like others do, you dominate them physically and tactically besides being overall quality players ofcourse. But we have lost this edge without Tevez and Vidal and replacing them with a tidy but timid Khedira and a Sturaro who fights but is lacking in almost everything else.