User blog comment:Cory Jaynes/Reapers origins/@comment-737801-20110801163628/@comment-1942617-20110802235356

@Original Post, The Protheans could been the sort of insignificant life that the Reapers usually ignore on their Galactic Purging, and only gained sentience some time after the Reapers left, built up their Civilisation over a few millenium, and then be purged by the Reapers.

If the Protheans had gained Sentience before the 100,000 year ago mark they would have been purged, and there is of course evidence that other civilisations before the Protheans were wiped out by the Reapers, Therefore the Theory that the Reapers are all Prothean Reapers is debunked. At least thats one question answered.