I was doubting this move yesterday, but I actually think this was a great thing by the prosecution to play his testimony. The first jury obviously bought some of his testimony, and he came off as "real" to them (I'm assuming). But by replaying a video, it's cold and detached. He's not sitting three feet from them, reacting to their faces. It's going to take away from any human element the jurors could have gotten from his testimony in person.