>>535236663
The root privilege is only Rover's command of Imperator. Imperator asked for the removal of it to have free reign over the plan to learn about/destroy the Threnodian. Which led to the merge and Tyrvine in the hands of the Fisalia.
The 1 resonator per 1 sentinel is different, it's more of a natural law. When Carte was conceived by Leviathan, she became de facto Imperator's resonator too. Tyrvine existed as a failsafe, should anyone resonate with it, the breach of the natural law should have destroyed Imperator, Leviathan, and both resonators. Canta chose differently by refusing this fate which led to the current last 20 years of Rinascita.