It's 'Til Sea Swallows All not 'Til Leviathan Swallows All.
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They don't lose the ranks. It is still there in the old GC while they build up a new rank in the new GC.
Excluding them from pvp in this example would be if they can't use the old ranks and can't build up a new rank.
About claim or not to claim
free running open world enemies = no claim (in this game we use kill sharing, so don't be surprised suddenly. Everyone can attack. The claimer need only to attack once, the others need to do at least enough dmg)
force poped enemies = party/player reserved enemies (but you would know then where it is, no hunting down)
I'm just saying then, in terms of difficulty, speculation is: Elite Monster > Elder Primal > FATE boss > ladybug
That seems kind of backwards in terms of progression. Oh, wait ...... nevermind.
15 days, not 1 month
If you want to know what exclusion is, you should have played 1.0
Once you choosed a GC you was in the GC forever.
doing Chocobo Escourts only with people from your GC. Doing them only in the region of your GC (as a twin adder member it was Tranquill and Treespeak). And no way to change another GC after it.