One more thing that we are sharing :-)) Me too think that the top illustration (Requested Privacy Settings) is confusing now... I used group theory for this graphical representation.

In my previous schema (that was looking like a target) member "A" and member "B" had to be Mutual Friends before "A" to be able to grant "B" with Private access to some files and/or some pages...

As for Group, I did forget this Privacy Settings option.
Maybe not all the see more members of the same Group will be Mutual Friends...