1. How to introduce roosters.
2. Do they have to meet as younger roosters (before hormones start raging)?
Generally, introducing adult cocks to each other won't go well. If possible, raise the cockrels together, or keep adults separate. I've had as many as six males together in the flock, with no problems, but that's not likely with birds who just met. Are you breeding different groups? Do you really need more males? Depending on them for predator protection is fantasy. Mary