In the trial I was a juror in, the defence virtually said nothing the whole time, presented no evidence nor witnesses and the accused was aquitted. It was really quite powerful and intriguing. They presented a very compelling closing argument.
I feel having GL take the stand in this case is probably a little less risky than it normally would be. Firstly, GL has the ability to think calmly before responding. But mainly, his story is probably 98% true....he just altered 2% of it which is to say he didn't kill them. He probably won't have trouble remembering that 2% that he's switched around.