User blog comment:Ironreaper/Retcons and Contradictions in the Reapers/@comment-1679409-20120418073043

You bring up some good points. I'm more concerned, though, with these two things. First, why do the Reapers need a vanguard to signal the keepers to open the Citadel relay into dark space if the Catalyst is in the Citadel? Second, the mind-blowing illogic of the Reapers being a synthetic race that brings chaos and destroys organic life whose task is the stop synthetics from killing organic life and bringing chaos.