So you're saying the other species won't question them about not revealing that artifact?
Ah, but they did reveal it, to the only ones who could access and understand it, and at exactly the time it was ready to activate. They protected it for millenia, and made it accessible just as their Prothean visitors of long ago had instructed them to do. The other species will hail them as the heroes of the cycle.
The asari are already in trouble for withholding that artifact. The robot even told Liara that penalties for withholding anything having to do with the Portheans is among the harshest punishments in the galaxy
Yes, EDI is a great source of info, but she neglected to mention the grandfather clause.
See, I can make up crap, too.
I think that the Leviathans are the ones to blame for the Rachni's 'sour yellow note'. Personally, I don't like it because it kinda derails the Rachni's character a bit "We didn't mean to kill you all in the Rachni Wars, we were mind controlled!" It removes all growth and conflict out of their character (IMO) because it places all their flaws and shortcomings on someone else.
It's possible, I suppose. The actual message (on Illium) says "But we know you seek those who soured the songs of our mothers" - and in ME2, Shepard is seeking the Collectors (who work for the Reapers).
Also, I would have to point back to the post I made earlier; if the Reapers were capable of controlling the Rachni Queen, why did they leave her shackled and retaining her free will?
Was that the original Rachni queen Shepard released, or a clone? If it's a clone, you're looking at a lot of theorycrafting to suss it all out.
But honestly - sometimes the things that happen in games have to do with budget and gameplay. It may be that she was shackled because they didn't want to design combat with her, and it gave the player another opportunity to decide whether to free her.
P.S. I always like the way the Rachni talked, the intermingling of sound and color, when they tried to describe things really fit well with their concept.
They are an intriguing species. I'd like to see more of them.