Saw second vet. His temps are normal, skin is reasonable (the dust bathing is really helping, and she wants me to continue), heartbeat and lungs sound great. He's also put on a good amount of weight (he's gained 1/4 the weight he was last week). She agreed that he was extremely energetic and alert. She suspects the joint swelling is mycoplasma synoviae, and has put him on Tylan and a pain med/anti inflamatory. She doesn't suspect any broken bones, and suggested a corrective harness to prevent his legs from coming in uneven or short due to sitting on his hocks for extended periods.
She thinks in spite of everything he's been through he might still make it since he's very active (he preens, glares at us/watches us when we talk, attempts to flap and get around) but wants an update Friday AM- if he hasn't responded to the Tylan the only other thing she could think of would be localized staph infections, but the TMS is a broad spectrum antibiotic and is effective against staph infections so that likely eliminates it.
Oh, and he is definitely a HE. She was able to vent sex him during the temperature-taking part of the exam, poor little dude.
Here's some photos of him in his corrective sling, watching videos of quail (mostly for the sounds, I don't think poultry can make out what's on the screen? not sure)
http://imgur.com/a/1mcP6