How to make more players succeed in coil.

[Gardes]

One i clearly stated that members who played that week would be loot locked. Two this will make an FC more of an FC, what good is a FC if they can't help other members get past the hardest content? Three I pretty sure if more people knew how to clear the last turns the amount of gil cost for carry groups would decrease since more and more people had cleared it.

8 players go into coil turn, gets 2 drops plus sand/oil/tome and gets distributed. They get out, one member leaves, a new player joins.

They clear the turn again and 2 drops plus sand/oil/tome drops again. 7 old members can't roll on it, the new player gets them all?

How does this not sound exploitable?