What if we are looking at it backward?

That mass is an effect of gravity, rather than gravity a property of mass?

Gravity is a centripetal effect.

Synchronization is centripetal, so if we were to factor in all the synchronization occurring across the entire radiological spectrum, it would be far greater than just that associated with the more dense manifestation of mass.

The curving of the light wouldn't be caused by gravity, it would be gravity.