So glad that he is doing much better. Thank you for the update. This is really a common issue when hatching birds. You alway have to come up with a plan for the extra cockerels.
Sorry about your rooster, but he has most likely been beaten by the older rooster. He is at that age where he is maturing and starting to breed. I am worried that his left eye may be punctured, because of the red jelly-like substance. Keep him separated in a pen or wire dog crate with food and...