Slow to feather is absolutely true... he looks nothing like the EE's of the same age that you all have!
Need to be patient, it's not his fault...
When I got him, this little naked creature was running around a big pen with birds of assorted breeds and sizes, he was the tiniest one by far and the only naked one that I could see. How the "breeder" could say he was 10 weeks old just blows my mind - he knew I'd take the bird anyways, the cold-hearted bastid, but still! If you can't manage your flocks better you have no right to be a breeder!
That guy has his chickens in a vast barn, not heated.
We're having arctic blizzard conditions these days, temps way below normal and winds cracking trees in two.
This little guy would not have lasted another week there.
The limping started two or three days ago, looks like a sprain cuz it just appeared one afternoon, in the morning he was fine.
But the weak legs he's always had, more or less - not very noticeable but now that I think about it, yep he's never been really solid. He eats and poops like a trucker, too. I've considered he might have worms even if his poop is normal, so he's getting the garlic treatment now.
But still. Could he have rickets??