Last stand is actually a viable pick on Zao. You depend on your mobility a lot. Your engine room might not get broken vast majority of the time, but your rudder might get knocked out more often then you would expect. And let me make this clear, if your rudders is out, you will die.
On other hand Demolition Expert is redundant. You have 17% base fire chance with 12 really accurate guns. 2% won't really do you that much good and you can profit a lot more from other skills like one extra skill for 1 and 2 points. Priority Target is always great same as Adrenaline rush. Expert loader on Zao is quite good to take that opportunity AP salvos since IJN both AP and HE are quite good.
As for anyone still arguing for DE, watch How it Works: Fire. With Zao accuracy, you will, more often then not, keep hitting same part of a ship so you can only start 1 fire in that location (to if enemy doesn't have a skill). So once that fire is burning, all your extra fire chance is wasted. With Zao, roughly every other salvo will start a fire. You really don't need that extra 2%.
