no clipping wings on any bird does not hurt them, feels a lot like when you get your hair cut (nothing at all). .. oops someone already said that haha. As long as you dont clip the blood quills in the feather you are fine.
Why would you cull them? I have had "meat birds" as pets, and they turned out to be the best pet chickens there was, along with being a good extra large egg layer.
It seems that you have a pretty common group here, imo i see buff orps, rir, maybe a wyndott or 2 a polish or may be a Cream crested legbar, a barred rock or plymoth barred. But, I am surely not the breed specialist here haha.
I'll be honest here, I have no idea what that is. It almost looks like a sac of blood and/or puss and blood, but I am no vet, but it looks like just a growth of infection. Again not sure. And i don't blame you for not wanting to mess with it anymore. But i would give it a few days, if it doesn't...
Interesting. I guess i never really had a "special technique" when it comes to training chickens, they just seem to want to do it. I have either gotten lucky with the birds i have trained or, i just have a special bond with them in general. I do know that the people at the poultry auction call...