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Sorry for the loss of your cockerels.
Lack of protein is one of the main primary causes of cannibalism, especially when birds are housed in close quarters. They will eat every loose feather they can find as well, trying to further make up for lack of protein their bodies needed. 4 week old keets are not aggressive killers, they are hungry, and flock raiser does not support the nutritional demands that the growth spurts and molting puts on their bodies.
If you've noticed on the back of the flock raiser bag, in the feeding directions section it says to start feeding the flock raiser to turkeys when they they are 9-10 weeks old, and prior to that it says to feed them startena. Guineas and turkeys have very similar nutritional needs (which is why high protein turkey starter is recommended for keets).
In the wild, keets eat a high protein diet of bugs, small reptiles, seeds/grains etc (higher than 20% protein) which allows them to grow fast and feather out quickly so they are able to run fast, fly up to roost safely as soon as possible and survive. Compared to your chicks, (which grow and feather out much more slowly than keets do), I'm sure your keets did appear to grow out "fine"... but to be honest that is not an accurate gauge for evaluating keets' growth or health.
I'm not attacking you or your poultry husbandry personally, I'm just not an advocate of feeding lower than recommended starter feeds to keets, for many reasons, and cannibalism is another.