Hi there, my static raid group is currently working on A6S, one of my friend came to sub to help us out yesterday because our BLM was late. Since his static is on Friday and Sunday though, his static is saying that if he enters A5S with them, he and they won't be able to get any books or chest.

It seems pretty weird since our static cleared A5S on Tuesday, but our BLM couldn't be there so we had a sub to clear, we got out books, our chests and we went to A6S to practice it a little.
On Wednesday we went back and cleared A5S for our BLM, she received her book but of course no chest since it needs at least 4 people who haven't clear to get at least 1 chest.

Since we already went to A6S and we went back to clear A5S with the main BLM in our static so she could get her book. I'm pretty much calling BS on what they are saying. Does anyone has an answer for me please?
Also to remind he wasn't the sub we cleared A5S on Tuesday with.