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Hi Rob;
Boy, this is tricky. From our perspective, it seems that as galaxies move closer to the horizon, they are heated and radiate back as photons. As they cross the horizon, they don't notice anything. We must notice the photon radiation, (being directed inwards, as they pass the horizon) and it must be equal to the radiation of the escaping galaxy. It would take 15 billion years for us to notice it, though.
What do we notice after they've gone ?…
Whether the escaped galaxy is real, and how they fit into our description of the universe, has got to be unknown to us. what they left behind when they departed must linger because information is never lost (this is the laws of entropy in action).
In short, I'm not sure how would effect the graininess (??).
Cheers
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