Ok, I had some computer-access issues, so couldn't keep up with the posting. In a nutshell:
He is now crowing, though only 3-4 times in the morning.
He remains a wimp in regards to the other roosters, but is getting better (more on this later)
The god-awful-looking parts of his combs are looking better (but still bad) - I don't think he'll lose as much comb as I first thought.
His wattles are down to the right size length-wise, but are still swollen width-wise. Since they're much closer to their normal size, he now has no problems eating at ground level (he needed his dish raised so that his wattles wouldn't hit against the ground up until yesterday).
He's making ******-off chicken noises when I do something he doesn't like unlike before when I could do whatever the heck I wanted and he wouldn't protest.
I think he may have been injured in the neck during his fight - I couldn't see anything with his wattles so swollen before, but now that they've shrunk back down, it's clear that his neck was wonky and is almost better. Lucky that sorted itself out...
We moved him outside today (would have done this sooner but the weather was bad) and after his initial suspicions, decided that "outside" is so much better than "inside" that it was a bit tough to get him back in his box so that he wouldn't have direct contact (read: fight) with the other roosters. They are in the coop, he is in his box with a mesh "wall" in the lean-to.
In regards to him being a wimp: he bowed his head to the lowest of the roosters the second he got outside. *sigh* But, by this afternoon, he was all puffed out, standing tall(ish) and looked kind of like he was looking for a fight - he broke out of his box-pen to go find the flock and it was just good luck that I happened to be going around checking water at that point. In any case, I'm hopeful he can be reintegrated into the flock without needing to cull some of the other roosters earlier than we'd planned on (one especially has become incredibly aggressive - the one who attacked him - but aside from him they were all slated to join the big stewpot in the sky before the end of winter, so...). But, if it comes down to his safety, we will do that - keeping him indoors during the coldsnap was very taxing and very bad for my husband's asthmatic lungs.
The short version of this is that the serious life-threatning injuries recovered to "ok" very quickly, but he's clearly still healing from the frostbite and it very, very, very clearly took A LOT out of him.