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I'd rest him in the fridge for a day but not sure I'd brine him that long. Depends how big a salt eater you are. They do get a bit salty after a few hours.
Enlarge? You can fatten them a little, I think mostly with corn, but it won't add much to the meat, if anything. Cornish X have much bigger breasts than most others. It's not what they do but what breed they raise. He WILL be skinny, compared to store bought Cornish X.
Well, you could learn to caponize, I guess.
In my experience of raising the dual purpose as well as egg laying breeds for many ,many years... feeding corn to an older skinny rooster in a confined cage will mostly add yellow intestinal fat as well as into the skin making it more yellow. It will do very little to add breast meat. It will, therefore, increase flavor as the flavor comes from fat. One can feed most roosters for months on end this way untill they succomb from obesity and they still will not compare in breast meat production to the commercial Cornish X at 6-8 weeks of age due to it's genetcs. It will also make them a little less stringy due to inactivity of confinement. 40-50 years ago, the dual purpose chickens were much more suited to meat production as that was their intended use. Today's so called dual purpose birds are a far cry from the original birds as they have been selected more and more for egg production and now resemble an egg layer breed more than the original dual purpose type. This shift was necessary due to the commercial development of the Cornish x as the most economical meat producer and are raised by the millions. They simply could not compete in the commercial poultry meat marketplace. The dual purpose breeds of today are still the mainstay of the small farm flock as a niche market for those that want free ranged or organic meat and egg prodution where time and labor are not of much concern.