See following threads.  I have battled something that sure looks like what you and your rooster are up against.
https://www.backyardchickens.com/threads/mareks-long-term-prognosis.625129/
https://www.backyardchickens.com/th...-in-mareks-infected-hen.733001/#post-10184149
	
		
			
		
		
	
				
			https://www.backyardchickens.com/threads/mareks-long-term-prognosis.625129/
https://www.backyardchickens.com/th...-in-mareks-infected-hen.733001/#post-10184149
	
  Feed him All Flock or the Feather Fixer, put out a separate dish of Oyster Shells for the hens.