I would agree that if his eyes looked like that when you got him, they should not have sold him to you. Quarantining any new bird from an existing flock is helpful in not bringing in a disease. Could he have had his eyes pecked since they also tore off his earlobe? If you cull him, it might be a good idea to have the state vet do a necropsy to look for Mareks or whatever is wrong. I do not get birds from other people anymore, only baby chicks from a hatchery or feed store because of the threat of bringing in diseases. People can be either unaware or just dishonest when selling chickens.