Nightsister Solo - Is it possible?

With enough potency you should be able to get the speed down and tenacity down to stick and you should be able to remove enough tm to solo it but it won't go as fast as a zader lead. Assjj gets her stacking offense from opponents or allies being defeated. You only have the two side minions in phase one then it's just the rancor so there's not much potential to build up assjj's damage. If the gamoran is able to summon more minions, you're letting him take too many turns and I wouldn't suggest purposely doing so. You may be able to get a little stacking offense from zombie dying but once again if the rancor is taking enough turns to kill anyone, you're doing it wrong. But with a fast enough zombie that taunts enough it may be possible. Zader on the other hand, can stack up dots without allowing the enemy to take a turn. But assjj is good for haat and the sith raid where there are more minions so her zeta isn't a waste. But I don't think it is a very efficient way to increase damage on hpit.