User blog comment:J.C DENTON 4 LIFE!/Mass Effect 3 Possible Leaked DLC/Leviathan (of Dis?) DLC Spoilers!!!!!!!!!!!!!!!/@comment-4237253-20120627165038/@comment-4118072-20120627165446

I think its more likely that Leviathan is talking about Harbinger being the first Reaper, not they are the same Reaper.