I'm pretty sure that Bistan can perform very well - his dmg is good and his TM reduction is awesome, if you fill him with potency. Also frienzy gives him 100% TM after special attack of ally so it's kinda similar to Ackbar's special with that difference that you don't decide which ally will have additional turn, but you choose one, which will give Bistan additional turn.
BTW Mace- he might be good fleetcommander and if he would have better % of expose he would be crucial. Expose with successful hit is simply decreasing 20% of current target's health. If this chance would be 60% + , Mace would be a beast. Also I'm not sure whether potency help in this case or not. Do you know something about it?
