He is still on chick feed right now. The other chicken pictured is also a rooster of the same breed and age. It's hard to tell in the pictures but his legs look significantly bigger in person.
I have an 11 week old chick who is having trouble walking and has very swollen legs. When he tries to walk it looks like he is walking on his heels and looks unsteady but he stands very straight up. 90% of the time he is laying down with his legs completely straight so his head is almost resting...