User blog comment:Diyartifact/Shepard's adversaries/@comment-1895174-20120408234519/@comment-1786741-20120410013021

@LoveWaffle

Think of it this way. Both Saren and the Geth could operate completely independent from Sovereign. Collectors on the other hand have no real intelligence an CANNOT operate independently from Harbringer. Even though 60% of the time in ME3 you fought husks, they are simply tools used by the Reapers. The Collectors were specifically Harbinger's tools. Using that reasoning, you can infer that Harbinger is in fact the main antagonist in ME2.