I'm not sure if this is relevant, but - is it the case that there are fundamental differences between gravity waves and light waves? For example, gravity waves are thought to propogate from black holes right? Light waves can't escape black holes. So maybe the comparison to red-shifted light is invalid in some way? I can't help but feeling though, that the wave-length of gravity waves must increase in expanding space. Then I try to consider gravitons, higgs fields, inverse square law, blah blah...

...meltdown.

Someone pass the burritos?

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If something is in me which can be called religious then it is the unbounded admiration for the structure of the world so far as our science can reveal it... of the manifestations of the profoundest reason and the most radiant beauty, which are only accessible to our reason in their most elementary forms...
Albert Einstein