If you want, you can do (most of) it by pumping Luke Farmboy to g12 and his strength compensates for any weakness in others being below the recommended gear level.
For example, I had Stormtrooper Han and R2-D2 at about gear 7. But with Lule Farmboy 12, it didn't matter.
NOTE however, SPOILERS FOR THE GAME, Obi-Wan has to fight by himself at one point so he needs to also be pumped.
Old Ben should be gear level 9 at least, but he's one of the easiest characters to bring to g9 so it's not too bad. I would not recommend bringing Farmboy Luke to g12. The event can be done with both him and STHan at g8 if you raise Princess Leia to g11. Leia is a much better character than Farmboy.
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All seven stars and well geared?
Seven stars, gear 8 or 9 minimum.
Yes all 7*.
Moved to the Hero's Journey sub forum, look around here for some ideas on the gear levels.
For example, I had Stormtrooper Han and R2-D2 at about gear 7. But with Lule Farmboy 12, it didn't matter.
NOTE however, SPOILERS FOR THE GAME, Obi-Wan has to fight by himself at one point so he needs to also be pumped.
With that one shot everything.
R2, Leia will be used later, Old Ben too probably, STH was already there due to heists.