I can usually complete GW without casualties (thanks to analyzing the set-in-stone process of attacks through trial-and-error-retreats) running my Sith team:
Nihilus lead
Vader
Dooku
Emp Palp
Maul
Too lazy to record my mods/gear. Don't have any zetas yet, I realize my difficulty rating won't be as high as others. Whenever I hit a wall in the RNG, sometimes I throw in a sacrificial squad of low level guys to burn enemy Cooldown sand reset RNG for new encounter. Otherwise, I experiment on best opening to kill highest threat levels, like Yoda/Rex/GK so I can make sure my debuffs go through, then see if I can do the rest without any deaths.
If there's absolutely no avoiding it, I might grit my teeth through not getting my original strategy and use my other teams to burn through one guy at a time, then go back in with my varsity team and experiment all over again. I've never experienced different set-RNG results by repositioning toons. Only:
- Change of leadership
- Swapping a character in or out
- Changing mods
- Upgrading stats/abilities/gear in any way
My experience has shown as soon as I enter an encounter, every possibility is already calculated. It's only a matter of exploring those outcomes and finding the golden formula for the order of actions that need to go down. Butterfly effect, yo.
EDIT: as per savage, I've found dooku under nihilus lead and he will go on FOREVER if they are the last two remaining. Too many multi attacks, can't sustain shock long enough, he heals back up too quickly, and dooku's a beast at countering/self-healing.