The thing with Cerci is, that he fits our starting teams better, whereas giovinco is useless against static defending teams, and only shines when they are tired leaving loads of space.
Cerci, has shown to be good as SS this season, but could also allow us to play with wingers. NO, i dont think he's a long term starter, he's far from that level, but IF we need to hardcounter an opponent with hardworking double wings, Cerci is a conte's favorite.