Gilgamesh Team decided:
Snow: Kaiser Knuckles for wind/water and as much HP as I can get on him, I can reach 10-11k. Will use Water attacks when applicable.
Refia: Self explanatory
Noct: Excal/Chiri for holy/fire using Warp Break and rez Refia should he ever need to, also mana battery. Main DPS, will be well above 850 atk.
Greg: Trident/Golem staff for Wind/Water/Earth via Wind Slash. Weak dps due to weapon selection but it's necessary.
Lightning: Excal/Verand using watera blade for holy, fire, water coverage. 2nd dps, will try to get above 700 atk but lack of native passives/masteries makes this difficult. Wish she could equip staffs then I could turn Greg into my 2nd dps beast.
Redundancy for all elements except earth but I can fix that with some fiddling around. Bring it on Gilgamesh!