This game wasn't a real test, but good for him to get some minutes in his legs.
About his passing. He didn't make mistakes, but had a few situations where he could have maybe played it forward but he preffered to play it back to Bonucci instead. It's understandable, it's his first start, he doesn't want to misplace a pass and put the back line in jeopardy. Seems like a clever lad, important attribute for a defender.
Also, it seems he's not yet used to play in a back three as he looks really unassured when playing in a right back zone. This could be the reason why Allegri kept him benched.