Freeza Under The Shower
Member
Vega is the only survivor cementing the 'worst possible ending' status.
All alone, with himself. Talking to plants.
hmm.
Yea the part where it turns to look at you when you first show up, almost like he was saying "Hey man!" then went right back to work.
as far as I can tell:
The conclusion you're supposed to draw at that moment is that the Citadel is where the Reapers make new ones, and where (by extension) they must all have come from. The dialogue just doesn't acknowledge it, but looking at Casper, that is what you are supposed to realize.
(there is also a somewhat similar design to the collector base and the citadel)
The keepers are working on the bodies, but they didn't have a different animation for them (those running animations are a hint of that). Basically, the keepers, much like their surrogates the Collectors, build reapers. They may even be the original race that build the Citadel AI or the first race to be used by it, as implied by Javik's description of the synthetics in their cycle.