It doesn't matter if the links are separate from each other or in one long chain.

In order to get RAF experience, you need:
a) Two accounts, directly RAF linked
b) Characters from those accounts, grouped together
c) Within +/- four levels of each other
d) Both characters at 79th level, or lower
e) Killing content, or turning in quests, that has not greyed out to either of them
f) Within a certain physical range of each other

If you have:
A > B
A > C
D > E

To fulfill these requirements, you cannot boost.
B & C, need A to be low level like themselves.
D & E, need to be of similar level.
That is five characters, so you can level together just fine, via Quests/Dungeons/PvP.
But you don't have space in the group for an extra person to run you through dungeons.

If D is not linked at all, it won't get RAF experience.





Basically if you have one account [A] existing (this is the strongest RAF method):
A > B > C
A > D > E
In this case A boosts; if brand new, level a x5 group with a Pally/Druid on 'A' to 85+ then use that to boost.

If you have to have two accounts [A & B], and cannot consolidate toons onto a single account or otherwise only use one of the two for the RAF:
A > B > C
D > E
You can boost with A, as there is a BC and DE link for RAF, but A will end up with half as many toons as you boost.

If you have three accounts [A, B, & C] or more...
A > D
B > E
C ??
You basically need to RAF in phases, where you create two RAF links A>D and B>E, then use C to boost; later RAF C>F and boost those, keeping or ditching 'F'...




I'm doing the third option, as I already have five accounts [A, B, C, D, & E].
And want to end up with ten.
Phase 1: E Boosts A>F & C>G.
Phase 2: E Boosts D>H & E>I.
Phase 3: A Boosts E>J.