If you can, I would highly recommend getting Dengar to 7* and geared up. He is pretty important to taking on Chewbacca. Not essential, but important enough that it will definitely make things easier for you. Don't worry about Greedo, especially if he is severely undergeared as he will just get oneshotted (likely). My characters were G12 Bossk (zeta lead), G12 Boba, G11 Cad Bane, G11 Dengar, and G12 IG88. I had no qualms with gearing these characters up since they all have ships (save Dengar), and the Galactic Bounties events practically require these or stronger for the top tier rewards. 1 zeta (leader of choice), and pretty high gear on whatever characters you use should be fine. Plus if RNG is nice, you can get him to 7* in a few attempts. Best of luck!
