ST answers a lot of your questions as battles last much longer than imagined. B-2 and Baze aren't really an issue as this isn't a buff heavy squad, it's debuff heavy. Yoda and Rex can cause some problems but in general Rex is too slow and will be ability blocked first by TFP and then by boba. Baze and ST usually ignore saving Boba's execute for either EP TFP or Chirrut. Most toons have AOE in this squad so taunts aren't that big of a pain. Plus TFP will hit with buff immunity.
The obvious 4 are EP TFP boba and ST. I will use STH until I get GK. His TM gain is very helpful to TFP and EP who usually start with a bunch of TM to begin with.
