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An adult rooster can do quite well on a 13% protein diet as long as the complete complement of amino acids is there. Best feed that you may be able to find is a 15% finisher feed. 13% protein would be better but you can achieve that by adding a bit of grain, greens and fruit to the diet. Since...

Likely. The research was done by the University of Arkansas in 2012. There are hundreds of companies that breed broilers.

They are beginning to, now that the research has shown the cause but it hasn't always been that way. http://www.thepoultrysite.com/articles/2337/urolithiasis-in-male-broiler-breeders/

That's exactly the point. Roosters don't lay eggs. Layer feed is for birds actively producing egg shells. 4% calcium is too much for non-egg layers. I'm not saying definitively that is what is affecting your bird. If it is kidney damage and visceral gout, you can't reverse the kidney damage but...

Are the pellets layer pellets? If so, has he been eating layer for the last 2 years? Do you know for sure another rooster attacked?