Islands defence re-spawn

[selphe]

I have noticed that when I blow up all of the turrets and AA guns on my way to the command centre they do not re-spawn after I hack the command centre.

Also I have noticed that if I blow up the enemies defence command centre and then build my own defence command centre the layout of the turrets is different, this would be ok but I get less turrets!!
Is this something to do with the defence multiplier for multiple defence islands being next to each other?
If so is there a range limit? or if the next island is also defence (even though it is 2 to 3 hours away) it still gets this bonus?

Thankyou

[SiC-Disaster]

Are you sure that the island HQ you destroyed and replaced wasnt a defense island, replaced by something else?
And afaik it would seem to me that turret defenses spawn after your gone and have captured the island, but that's just something I'm assuming.

[Mafia101]

They will respawn if you leave that system (island).