I posted this in another thread, but it correlates so well with what you found, I have to put it here too. Just going by the new icons on wowhead.com, it looks like this (inv_staff_branch)and this (inv_arcane_orb)are put together to make this (inv_stave_2h_firelandsraid_d_03_stage1)which somehow grows into this (inv_stave_2h_firelandsraid_d_03_stage2)and finally this (inv_stave_2h_firelandsraid_d_03)Which easily looks just like it could be made from the datafiles you found.