Well, leaving out the fact of an immunity deal is a huge omission. EDIT: immunity granted by the court, rather than offered by prosecutors.

And they quote one of the parties complaints about the time when the GJ was set up without mentioning whether it was set up specially or just in line with the normal calendar schedule. The jury in a trial is specially convened for that case. Grand juries typically sit for several months at a time and issue indictments on whatever happens to come before them. They're completely different from trial juries.