based on what i can tell
theres are 31 NMs in the ZNM system...
but you can split them into 3 branches..
Hydra, Cerb and Khim branch
the progression is 3 > 3 > 3 > 1
tier 1 and 2 drop triggers that trade for the same seal, so the flexibility is that you can do whichever tier 1 and 2 NMs within the same branch that you want.
For tier 3 however, you'll need to kill all 3 NMs to get access to the Tier 4 zNM. Since these are RA/EX that trade to become Temporary Key Items, you'll need to make sure the person unlocking the 4th tier is the one lotting the triggers
and the person unlocking the 5th tier has all the tier 4 drops...
of course, since you'll want to speed up the system, they cant all be the same person cos of the way points are spent.
all in 9 > 9 > 9 > 3 > 1
I'm working on my chart atm
XI Wiki

