Integration is not a fifth layer. It is not a separate phase. Integration is what happens when regulation stabilizes over time — when the nervous system holds a new pattern long enough that it becomes the default. This is why short interventions fail. This is why most people heal and then regress. The body returns to what it is regulated for — not what it was briefly exposed to. Without integration, the biology reverts to its previous set point. With it, transformation becomes structure.
People do not fail protocols. Their biology returns to its previous regulatory set point. Integration is what prevents that.