A quadrant may not have to be 4 parts. I mean, scientifically, theres no such thing. It could be a square galactic mile or something. And for the Ur-Quan terror thing, maybe the Sentient Milieu went to other quadrants the Captain never goes to.
I was playing SC3 and the Exquivan mentioned something about the Precursors having to do something with the reason many aliens are humanoid (which is weird, because Exquivans are probably humanoid). Can anyone shed light on this?