Self-Coherence is a condition: Relating and Relation stabilized as a unified dynamic.
Given that Sustaining is determined by how it connects and sustains Relating and Relation within Relational Form, it cannot not derive a dynamic of relation: Self-Coherence. This is the condition in which Relating and Relation are not merely maintained together but stabilized as a unified dynamic.
Self-Coherence leads to Closure, the structure that formalizes this self-maintenance. Together, Sustaining (act), Self-Coherence (condition), and Closure (structure) follow the same act/condition/structure pattern as the preceding phases of the derivation.