Just an FYI.

as long as one of the linked RAF accounts is leader of the team (Group)

The High Level can belong to the group and kill things and the rest of the group Gets XP and yes they get RAF

Just Make sure the High Level (The Leveling) toon does not have quest you want to get RAF experience for in there quest logs. (In short as long as only the RAF toons have the quests and the Leveling toon doesn't then whatever the leveling toon Kills the RAF get credit for.)

That way you don't need the RAF to tag. [The only issue is if a pet kills a mob without one of the group doing damage to the mob (but thats the same for any group)