The Pistons pick is top 3 protected. So they could be up on the dais only to go home with nothing (it would go to the Clippers if it doesn't hit, so the Clippers could have 2 picks, but at least will have 1).
What if this weird scenario happens where the lottery is revealed to be Denver at 14, LA at 13, and then Charlotte at 12. Everyone would then have to wait all the way to the top 3 to know if LA at 13 is the LA pick or the Detroit pick. That would be crazy intense for both the Clippers and Pistons (much like it will be for Boston and Philly if the pick is not called in its normal slot).
It is a really fascinating lottery this year with all of the potential combinations and protections that exist.
Plus you have the 2 teams playing later that night that have stakes in the lottery (I wonder if that has ever happened before).