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Interesting Phil.
Here's something to think about from a couple of your statements. Assuming:
1. Light is energy. Therefore 2. That energy released from a disrupted particle/piece of mass in the value of mc sq. ie. the energy we are seeing/measuring is the result of the disrupted mass, not the mass itself. If energy has mass then the equation would mean that mass is converted into another type of mass???
3. Is gravity bending light or is light following the geodesic deformity created in space time by mass produced gravitational fields. Ie the path of least resistance/lower energy cost of its apparently straight line flight. Also isn't light redshifted when it moves through this field implying it costs it energy to escape from it. If e=mc sq then the if the photon had mass to start with it would have less mass after leaving the field as it cost it energy to do so. If it had less mass then it would be less effected by subsequent gravitational field as the force applied to this photon mass by another would less (by the formula F = G m1 m2 / r2) This observationally doesn't apply. Light reacts consistantly with one gravitational field after another. Hence there is no mass loss. But there is energy loss, more red shifting. Therefore light has energy but no mass.
I'll get back to you on the rest.
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