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If anything, identities have the potential to get in the way of that. Of course identities should be protected 
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If identities of individuals who have not been indicted should be protected, does that mean the DA in Ferguson erred by saying that the police officer in this case was not indicted?
But let me just point out that you want a contradiction here. You compare Grand Juries unfavorably against a process which is inherently as nontransparent as possible - the choice of a prosecutor by some supposed “guidelines”. Further, you want the process to be transparent while not revealing anything which could damage people.
There are many criticisms of the Grand Jury procedure (heck, I can and do criticize aspects of it). But I don’t think you’ve put anything up here that really criticizes it usefully - and I think that comes down to a misconception about why it’s used. It isn’t there to be right. It’s there to protect citizens from the whims of officials.
No. Again it’s been explained to you that it mirrors your own system.
Angry mobs do not represent a public interest unless you think people should be prosecuted to placate them.
And it can’t do that if the only person able to give information is one of those officials, who works in secret and thus can completely lie about what you need to do. There’s no protection unless there is something to prevent the grand jury from being misled by the prosecutor. There is no protection from the prosecutor’s whims if the prosecutor gets to do everything in secret.
What he wants is some sort of accountability for the prosecutor. Some sort of standards he is required to go by and faces possible punishment if he doesn’t. He says this exists in the UK, but not in the U.S.
At the very least, there should be things that the grand jury must be made aware of, so they can make a valid decision if there is enough evidence to prosecute. Maybe have a third party who is unaware of the evidence, but advises on the law only. (I assume evidence is sworn to be true by third parties already, since witnesses exist.)
Conflict of interest restrictions and perhaps barring the prosecutor from making a recommendation would be nice, too.