Quote: I harvest my extra cockerels at 13-16 weeks, before they start making trouble and are still tender enough to put on the grill for that crispy skin goodness.
Not much meat, no, but the grilled bones make killer stock. Older than 16 weeks go in the stewpot.
You might be able to use those crate to asses your other cockerels demeanor's.
I find it hard to assess multiple males when together as it creates an environment of competition,
removing extra males can change their demeanor immediately and drastically.
Put the others in the crates and see how the remaining one behaves with the pullets and humans.
Then after a few days switch them out until you've 'tried' all 3.
They can stay in crates for a few days and nights, if they are sheltered from weather and protected from predators.
Best to put them out of sight for most the day if at all possible.
This might help you decide, tho a cock/erels true nature may not show until they are over a year old.