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It just looks like they are getting frayed and worn- normal wear and tear. Most hens and roosters will look pretty bedraggled before they molt. The original bad diet just adds to the cosmetic problem, making the feathers possibly weak or malformed to start with. BUT, the diet is STILL probably lacking. Your list of items you feed the bird is mostly carbs, with some protein. It is very difficult to supply a captive bird with all of the nutrients it needs to stay healthy. Since we people do not have time to create a balanced meal every day for them- the easiest thing to do is provide the hens layer ration and the roosters flock raiser or similar. If the roosters are in with the hens, they by default get to eat what the hens do. Feeding your rooster cheese, corn and cereals will not give him what he needs to live long term, and his feathers will look not as nice as they could. The feathers help show you the health of the whole bird, inside and out. Also if you are giving your bird grubs you find, you are also giving him parasites (worms)- consider deworming him periodically.
