A grand jury can’t be hostile to the accused?
I’ve never been under the auspicious eyes of a grand jury, so I couldn’t tell you. Sure, why not. They’re meant to add a bunch of laypeople to the decision on whether to indict a person. If Trump showed up, would they be throwing eggs at the man?
His legal team could have presented contravening evidence. When a yokel jury convenes, if they don’t get any evidence that contradicts the DA, the DA is the only one talking to the yokels, so the yokels are more likely than not going to indict.