There are some factors; i.e. pirates won't establish bases in REDACTED systems.
Aww man, that's a shame. I am loving the fact that there are things you can do to prepare for the battle proper with the pirate station. Kind of makes it feel like a straight up campaign rather than a one-off battle.
That being said, I hope you reconsider the pirates and REDACTED not spawning together. That would be an amazing opportunity for the player to strategize and exploit the enemy. Perhaps leading a fleet of REDACTED into the pirate fleets to whittle down their numbers and make the fight with their station easier? I feel there's a more potential for fun and variety than otherwise. Taking on pirate stations will be super fun, but I would love even more numerous ways to do so.