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General and Special Relativity are theories of observation. They specify what we must observe of we look carefully at the universe, regardless of how they are causally implemented. There is not yet a theory to explain how they are implemented. If there were, it would be a Theory of [insert appropriate noun]. Causation?If QM is ever explained, I assume that will be the same type of theory.
I think you can have a theory that is not supported by anything at all. It is only a valid theory if nothing contradicts it.
Yet a scientific theory doesn't require that it predict anything new. It's a fairly useless theory if it doesn't, but a theory really just needs to explain current observations.