We all know its Aun'va who's the best secret character!
His staff of incalculable power give him and his honor guard increased toughness and a reroll able 4+ cover!
..... -___- I guess stubborn is nice for tau..
You actually want Aun'va to die: Stubborn is a terrible rule for the Tau! Against shooting it almost never does anything and in combat, when the Tau want to fall back, they suddenly have better odds of staying. On the other hand FC and PE make suits almost decent in combat. And all for an insane price tag...