A is level 80, or 943 doesn't matter.

B and C are the same level (or within 4 levels of each other anyway) and are 59th or lower.

A -- B -- C is the link.

A and B do not get RAF.
So if C has disconnected, then B is shit out of luck.

B -- C is a link, so when they're grouped there is RAF.

So A -- B -- C.
You have no RAF from the A -- B link.
But you have RAF from the B -- C link.
So as long as B and C are together, they both get RAF.
It does not matter that B gets no RAF from its link to A.... it does get the RAF from its link to C.

But if either of B or C is gone, the other loses its RAF when only grouped with A.
Because A doesn't meet the requirements for the RAF bonus.

Pretty sure that's what I said in the portion you quoted.