User blog comment:GodzillaMaster/Truly Extinct?/@comment-4118072-20111118232524/@comment-4466838-20111119161816

I think the Council believed the "Reapers" would attack at any moment. But the time passed, and nothing of giant dreadnought attack. So they dismissed the thing of "millions of sentient ships lurking in the dark space", because was more plausible Sovereign being a Geth Ship.