[thejeff]

Luck of the draw. There's no way to reorder them.

Just to be clear, the slaves don't get any new paths or even automatic boosts in the paths they have. All they get is the benefits of path booster spells cast by the Masters. For Mystics, that's PotS, Summon Earth & Phoenix Power. +1 to every path they have, +1 to Earth and Fire if they have them.

So for those purposes all I'd really be concerned about is that one of the masters has Earth and one has Fire.