Zach Lowe has great stuff on how the Bulls defend PnR. LINK
He states that the way they defend is different from most teams. Something to compare when the Hornets defend the PnR. The Hornets have been awful defensively, but most of the guys are not sure what they should be doing on defense yet.
This quote stands out to me
The rest of the players are more limited defensively, but they follow the rules all the time. They know the game plan, the opponent's game plan, and the opposing personnel, in part because Thibodeau drills and re-drills all that stuff during famously detailed shootarounds and practices.
Hornets need more talent, but more than that they need the young guys to mature as professionals before they can become even an average defensive team.