Stars are not as important as gear and lvl. so the star count is just there to make sure you have made a certain amount of progress in game (i.e. farming)
gear 10 Talzin, gear 10 ventress, gear 10 Old Daka the rest at gear8 Might do it. Without NS zombie and spirit, im not too sure if NS squad under gear10 can pull Bonus Tier off to victory.
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what gear?
There's plenty of forum posts already explaining minimum requirements. Take a look around
i used PS for it.