After all they are CMs. Their main job is to defend and control the midfield battle/possession. Scoring comes later especially if you had something like this upfront:
Cuadrado/* - Tevez - Vucinic
Llorente
If you want CMs in advanced role then 433 is the way to go. Tevez on LWF and need to get a RWF.
He's not that bad on the wing ffs. He played there like two matches both against RM where he had to do a lot of running and defending. In a normal Serie A match he'd be in a more advanced role.
He's better in the middle that's for sure but not that bad on the wing.