I don't think the problem is that JY was able to dominate BH. The problem is that BH kept trying to catch JY in a lie, he would answer with a seemingly reasonable explanation, and then she would move on to another question without challenging any of his responses.
There's still that pesky problem of that humongous pile of 'seemingly reasonable explanations' that the jurors have to wade through and believe in order to discount the more likely, more direct route (imo) to get to 'he might seem slick, but he's guilty'. No matter how bad she might be, he's just not credible. jmt