Thanks for the feedback.
Based on those answers, it sounds like if I had the all the "first wave" ally/villain packs, then in the campaign game I would never need to have character chits. But in the skirmish game, I may still use the chits just to increase total numbers of units. Sound right? Or does the basegame itself have more than 3 rebel troopers and 2 saboteurs (in chits).
p.s. is there really a general weiss and royal guard champion chit in the basegame? I would have guess they just have to use the existing at-st and guards, unless there is a scenario where you really have to distinguish.
you only need the troopers and such mostly for skirmish. and the imperial stuff that is in the game already just add a few more missions and the figures have different postures. but for instance darth vader has a chit which u can replace with the expansion one (whcih comes with the game)