If you go with:
A > B > C > D > E

You end up with granted toons on every account, except account E.
Which is good, if you have a lot of toons on the existing account A.



If you go with:
A > B > C
A > D > E

You end up with a lot of granted levels on A, and some on B/D, with none on C/E.
If you have a booster on A, but very little else than this is a great method; that could be the case, if you transferred a booster with gold and heirlooms to a new server with other boxers... and then set up RAF there.

You would use "A" to boost BCDE.
Because there are "two-hops" in the RAF chain (two chains, but two hops in either chain), you need to level 2^2 characters for granted levels to cascade exactly.
So boost four toons on BCDE, with A, and granted levels work out perfectly.

C/E each give two toons (from 2nd to 80th), to B/D.
B/D each give two toons (from 2nd to 80th), to A.
B/D each received two toons from C/E, meaning they can each give one more toon to A.

A ends up receiving six full toons from granted levels.
B/D receive two from granted, plus the four from being boosted.
C/E each have the four that were boosted.

Unlike the A > B > C > D > E chain... four toons works out exactly, and any even number of toons works out better.




In my experience, boosting is the fastest leveling method.
It always work the same, and is not reliant on bugs/cracks in the system.

Put the higher mage in with the lowbies.
And Arcane explosion your quest mobs for kills or collections.
Have the slaves IWT with the corpses, on collections.

Ignore the reduced experience for kills, because of the 85 in your party.
Turn in quests 8-10x faster than soloing with the lowbies, and get 3x the experience on the quests.

Once you can enter instances (level 10), switch to that.
Park the lowbies at zin (zone in).
Gather a bunch of mobs with the high level and kill them near the lowbies.
Move the lowbies up.
Repeat.
Reset the instance, and go again.

Also you can "master loot" with the booster.
Set the slaves to pass on loot.
Set the loot threshold to say Uncommon/Green.
Things will sparkle, if they have a green to master loot.
But otherwise will not sparkle with only cloth/greys on the corpses.