Lay had some excellent attorneys working with him. It is apparent to me that Lay wanted to say what he wanted to say, regardless of who was doing the direct examination. I don't think that, ultimately, it would have made that much of a difference.
Overall, he held up very well and helped the prosecution. He came with a lot of baggage. But he did so much damage to the defense case. And most of the points the defense attorneys made on cross-examination didn't go to the crux of the government's case.