(2) Reclaiming the zone
This is after the zone has been captured by Kaezulians. During zone reclaim after the zone was taken, it becomes a claimable thing in the sense that a reclaim raid can claim the mobs they engage.
There isn't a 18 man cap for zone reclaim, though. If two groups (a group of 18 and a group of 5) both want to reclaim the zone, neither has claim over the entire zone, and they'll have to share, probably in separate parts of the zone. You are encouraged to communicate with any other reclaim raids in the zone and handle things like adults.
For nameds that were already up, they follow the same rule of "first raid to engage it gets to kill the mob". For nameds that spawn as a result of killing mobs during a reclaim, the raid that spawned it gets to kill it. If your raid wipes to anything, though, you have no time allotment that allows you to reattempt the mob. Anyone else can come kill the mob while your raid recovers.
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That should cover the vast majority of questions that aren't obvious correlations to the General Decency policies and the Raid Rules.