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It would seem we're at WAR men!
Although we're all in the same place "DnBleach" Doesn't mean we're all at war.
Sure we would all wish to participate, but only the selected Squadron may participate in the battle.
If you are confuse this basically just mean in layman's terms. We're different beings and not one. So, outsiders can't …

[1]All members of DnBleach can recruit.

[2] Any members in your squadron that recruits. The recruited is automatically in the same squadron as the person that recruited him.

[3] If a guest have not been brought in by one of the squadron. He is allowed to join any division of his choice.