Another poster quoted that post and agreed with it, so it's hardly such an esoteric concept that only I am able to understand it.
You posted that you can't separate the logic behind making the proceedings secret from the fact that the proceedings were over. My original response:
Yes, you can since the basis for that secrecy is how a public grand jury might affect a subsequent trial.
My amended response:
Yes, you can since the basis for that secrecy is how a grand jury might affect a subsequent trial were it to be open to the public, as opposed to in secret.
There ya go. 

Uh, right. You referenced a "public grand jury." I suspect Skip, who is a smart guy, didn't know you were pulling that phrase out of your rear end.
Honestly, I had never of a "public grand jury," so that's why I asked. I learn something new pretty much every day, so I thought maybe I was going to learn a new concept. No such luck. lol
In any event, allowing grand jurors to talk about secret proceedings destroys part of the bases for making those proceedings secret in the first place. But I said that already.
Also, regarding how this might affect other grand jurors, it would not surprise me if members of the Spike Lee ilk would try and harass grand jurors who failed to indict someone in a racially tinged case. Remember what he did in the George Zimmerman case?