My extra cockrells/roosters are sold to people who eat them. When I had a ridiculous amount, I just continued to feed and house them until they sold, and I lowered the cost according to how badly I wanted them gone. And of course offered discounts for bulk sales, but that's not relevant to you.
We dispatched one cockrell here because it just SCREAMED. It didnt crow, it just...on and on and on screaming. And I didnt mind the concept of it because it was a problem bird and definitely genetics I did not wish to further.
But I agree with someone up there ^ who said it may be easier to handle the death if the body goes to use. If a predator gets one of my birds, the body becomes bait to try to catch it. Maybe someone else would want to eat him and do all the work themselves.