It depends on what happens with Spanier and their sentencing.
If they take the stand and answer questions everyone has is that not a win for the commonwealth?
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By the commonwealth do you mean the OAG? Or do you mean the people of PA?
If the latter, then yes, this could be a win for the general public who wants the truth.
If you mean the Commonwealth (the OAG), then I don't see any way this is a win. Because they either will testify the same way the did previous (which doesn't help the Commonwealth), or they will perjure themselves (based on prior testimony) which also doesn't help the Commonwealth because they become pretty unreliable witnesses, especially given that their more recent testimony was part of a plea deal.
So in my mind that's a lose-lose for the OAG. I honestly don't think the OAG is going to call them as witnesses. Maybe the defense will...