Here's a bit of good news: after injuries, Matt Jones and Amile Jefferson are back at practice.
It's great news in general, but in particular for defense and on-court communication. As you know, Coach K coaches three systems: offense, defense and communication. Offense will be helped too because while neither guy is a huge scorer, both know how to and both know the subtleties of Duke's system.
In other words, they're usually in the right place at the right time doing the right thing.