sasha is the worst guard at getting through a screen i have ever seen, bar none.
Get some tape of the Atlanta series and watch Childress defend Ray on screens off the ball. Ray had 4 feet of daylight every single time without fail. It's just that Rondo and a few other Celtics didn't pass him the ball. That is likely the worst I have seen this season.
Vujacic is best used as a pressure defender which means he needs to be on the ball. His off the ball defense is fairly average. He's doing terrible stuff on screens in this series. He's normally better than this on screens.