Those things though suppose (I think) that Kurtz wanted someone else.
It seems yesterday once the guy got some time on the stand he gave solid testimony. Many who saw it today thought so too. I think Kurtz was really shellshocked when his guy was not qualified to discuss certain of the state's evidence and give opinions on it, and perhaps the witness would have done well there too.
IOW, maybe Kurtz thought this guy the jury will understand and will get the job done.
Still, dicey to use a guy for the first time testifying in such a high-stakes case.
A trial of this length has many things that are just tough to understand without knowing the behind the scenes. In the event of a guilty verdict, it would be interesting to see the appeals and their supporting briefs.