Stowe strikes again. The guy is worthless, and I can't believe people can't see that. He has not done the work, and it's one excuse after another, trying to always blame it on others (such as the "good old boys" messed things up, I didn't know, we didn't have time, we didn't know that's what the judge wanted, it's the TBI's fault, it's not my job because I decided it should be handled by a "special prosecutor," and on and on it goes). This guy has been a disaster from the day he was elected - lots of talk, and no real work at doing the job. I suspect he's managed to alienate the few witnesses they had persuaded to talk, although that's just an impression that has yet to be played out. But the discovery has been ignored for months, and that's inexcusable.
I don't think its a question of him alienating them, its more likely that what they claimed either was not corroborated by physical evidence, or worse, was contradicted by physical evidence. That would make their testimony worthless, and if the case rests on their testimony then it is pretty obvious that it is not going to fly.
When he came into office all this was already set in stone and beyond his control to change direction, so what was he supposed to do about it? There is no silk purse from sow's ears, so the choices available to him likely were either to walk away or to dismiss, both of which will put him in a bad light politically. I suspect that walking away seems the least damaging option to him.