Whats up with this quail? ?

So my husband told me to post this so I will, even though the chick is eating and drinking, and obviously growing.
We noticed when we switched brooders the other night that one of the birds has a lump on their shoulder/chest region and carries his head in a slightly twisted way, kind of like a hunch back.
What is this, and is it fixable? As mentioned, I've seen him scarfing food and he is one of the largest chicks (almost 2 weeks old?) in the brooder.

On that note, is it normal to have a bunch of big fat fatties and a few little ones? There's plenty of food, so I don't see why they wouldn't be more evenly matched in size. I may separate them out if the runts don't start making some progress. I don't see them getting singled out particularly...

BTW, the quail are coturnix, mixed all sorts of flavors.