I'm sorry that you lost one.
It sounds like there wasn't much of anything you could do, though, so try not to feel bad...
I'm really happy to hear that Tiny is doing well! I forgot to say, but one of my friends gave me a chicken once that was half the size of his siblings, and looked like he was half the age, too. She didn't think he'd make it or at least he'd be seriously stunted, so I took him to raise with a lone California quail I got in from my wildlife rehab group. The two bonded and became the best of friends. The quail would sleep in his feathers, and they'd eat together even though the chick was at least ten times the size of the quail.
When the chick outgrew the tank I had the quail in, I gave her back the chick. He grew, and grew, and grew, and now he's a BIG, handsome rooster named Lancelot! Much bigger than his siblings! She still brings him along to our wildlife rehab classes sometimes, introducing him as a "giant red quail".
The quail made it, too, and was released with a bunch of other quail!
Amazing how sometimes the ones you don't expect can pull through and become special birds.