Ciro had some experience... but a crap squad.
I can see someone like Ronaldo holding sway in the clubhouse too. We've all seen him on the touchline for the Euro 2016 final. And with that salary, all it would take is for CR7 to say, "Sarri has to go, this Pilro guy is OK" and it's done.
Meanwhile, with CR7 on the squad, perhaps you don't want an overly opinionated, experienced coach at the helm. Lighter touch. And you let him grow in the role.
At least I can envision those kinds of discussions behind closed doors.