Well Pogba had to do something to make himself useful. Vidal on the other hand was the real ghost. You can't expect Chisio to do everything do you?
Also the whole team was sitting back and looked reserved so most probably it was Conte's instructions.
Realy?!!! Pirlo
get's involved defensively? You mean like jogging back and following the opponent without any actual intention of intercepting?
makes useful interceptions when placing himself in front of the defence.?

When we're pinned back he just stands there in front of the defence, hardly stretching a leg. You call that involvment? we can plant a tree there and it could be involved that much.
At the end of the day, Conte loves him in that role, as is obvious from his post match statements and you're gonna see a lot more of him there so better get used to it.