Ikerth was approached by this new Extinction Legion because he held control over Zotov, so Miranda didn't want any one person holding control over the whole planet since the Extinction Legion might just somehow entice that person to their side.
She also wanted Zotov to be in the Argent Empire, because the new Extinction Legion knew Argent wasn't somewhere to mess with and stayed far from it.
"Ikerth became a Herald?
Wait…so that's why you said he picked up the law of Extinction?!" (Refer to Chapter 111)
Miranda's previous words now made sense to Jamie, after all, all members of the Extinction Legion were required to have a Basic RL Authority in the Law of Extinction, a powerful Universal law on par with Destruction and Annihilation.
Together, those three made the best trio when it came to erasing things.
"That's why I was after Ikerth because he was a Herald of this new Extinction Legion."