User blog comment:N7EagleEye/New Mass Effect 4 Details/@comment-79.112.179.186-20130603214045/@comment-5212406-20130604235932

There's also the Leviathans who also can make oily shadows. SO its now up in the air whether the Rachni were being indoctrinated by Reapers or Leviathan. You're also leaving out crucial details which as Lily pointed out IT doesnt bother addressing.