Gravitational waves, like frame dragging, are essentially very small, and only able to be detected by massive collisions.I understand the reasoning behind those who take the position that the source of gravitational wave energy is mostly massive events, like you say.
https://spaceplace.nasa.gov/gravita...onal waves detected,miles (4 kilometers) long.
https://en.wikipedia.org/wiki/LIGO
And yet to be verified.However, in the ISU model, all objects with mass emit as well as absorb gravitational waves as part of the process, and so the energy traversing the space between massive objects is continually absorbed and reemitted. One important premise of the model is that objects move in the direction of the net highest source of gravitation waves arriving from the surrounding space.