Call me naïve, but I think the GJ will go by the evidence and there will be no charges.
Every single time I've followed a hot potato case, where the decision was a slam dunk, whoever was charged with rendering the decision did the opposite of what the law directs. Bush v. Gore and the SCOFLA; Zimmerman vs. Angela Corey; Obama and Honduras - those off the top of my head.
Just saying you can pretty reliably throw "going by the evidence" out the window. The decision is made without regard to the evidence and law, and the explanation is crafted (in an attempt to conform it to the evidence) later.
Using that approach, I still come out that the local politics doesn't support a local indictment. Especially not when the feds are camped out, willing to do the dirty work.