Watching JB, I think he is making a critical mistake in handling all of the prosecution witnesses himself. The SA split up the areas of their case: Mr. George largely handled the social relationships, Mr. Ashton the scientific, LDB the police, some crossover, but generally speaking.
JBhas a large team, he should be using this team to focus on different topics. They each would be more familiar with their area.
Besides, it would help mitigate any frustration or dislike the jury may form.
I think it is his ego.