User blog comment:Arbington/The Next Cycle/@comment-5337704-20120803074623/@comment-899316-20120803190411

Actually, rachni indoctrination means no such thing. It could be the Vanguard's influence, or it could be accidental indoctrination by a Reaper artifact like Object Rho. Maybe they found a derelict Reaper? Not all indoctrination is done directly by a Reaper.