The "You wouldn't know them" line always cracks me up, largely because of the response it gets on BSN. Frankly though, we wouldn't know them, so what would be the point of assigning them an arbitrary name?
The liquization question is an interesting one - can't see it being the Batarians, or the Vorcha. Who does that leave? The Drell, the Hanar?
Was that it, were the Reapers going after Blasto?!
Re the Crucible - disappointing on Starbrat's part - they've been aware of the crucible design for a number of cycles, in the previous cycle the Protheans actually built the damned thing, so how come Starbrat, or the Reapers never bothered studying it to the point of being able to counteract it?