[Norfleet]

The better, more conclusive test, would be to simply do the following:

Take two Theurgs, script the first to do "Master, Slave, Astral Shield, Hold, Hold, Spells". Script the second to do "Master, Slave, Astral Weapon, Hold, Hold, Spells". If both of them end up with astral weapon and astral shield, it means a unit CAN simultaneously be a master and a slave.

Obviously, a unit can't commune with itself, so having 4 Theurgs would mean that each Theurg had, at best, 3 slaves, for a total of only +1 paths. Not enough for smite. If you had 5 Theurgs, that would have been more conclusive.