Q18 of LftP LIVE Part XVII Q&A Solution Found
"Q18: Currently, once you complete the Coil of Bahamut, you are unable to challenge it until the reset. If we are in a FC or LS with more than 8 players, it’s hard to sync the progression of everyone in the FC/LS. Is there anyway you could change the once-a-week system so that we could help out our fellow FC/LS members?
A18: As for the once-a-week system that we currently have in place, we are indeed looking into the matter, but we haven’t been able to find an alternative system to take its place."
but you already have a system that would work perfectly fine already in place for such content... its the one you use in the crystal tower! or if you wanted you could do something like
"once you defeat a boss for the first time in the week, that is your chance to get loot, even if you don't win anything you cant get loot from that boss till the reset"
so they can roll on everything the boss drops, but even if they get nothing they will no longer get a chance at loot for that boss till next week, but they will still be able to fight the boss again if they so desire(for practice, to help friends/FC members clear it). while on the flip side if say 2 tank items dropped, and the same tank needed them, he'd still be able to get both. just like in regular coil.
a system like this would function more or less exactly like how 2ndcoil works now, except that the weekly lock is on your ability to roll on items from bosses you already defeated, not on entering the instance.