Though they say that the excess calcium in layer feed encourages gout, none of my roosters have ever had that. They do suffer from arthritis as they age just like some of the hens, at least some of them do. My little guys never have and they eat layer feed, too.
It's hard to say what's going on with him. Has his color in his comb been off lately? Observe that, too, because if his heart is failing, and it happens with some very large birds even at a younger age, he will become extra tired and just sit a lot.