Hi, this is still just you saying "I want to speculate". Sure go ahead.
the theory has to make no provisions about anything outside the theory.
These are silly mental requirements to satisfy your hanging onto ontological models it is like saying,
"Germ theory is adequate, provided provision is made in the theory for no hypothetical beyond, in consideration of a possible infinite complexity of forms."
"Plate tectonics theory is adequate, provided provision is made in the theory for no hypothetical beyond, in consideration of a possible infinite complexity of forms."
"Cognitive behavioral theory is adequate, provided provision is made in the theory for no hypothetical beyond, in consideration of a possible infinite complexity of forms."
You are saying that the theory must presuppose something outside, when in fact all it presupposes is to model a specific thing.
You are saying that a non-ontological model must meet your need to have ontology explained.