Boba(G12)-Dengar(G12)-IG88(G11)-Greedo(G11)-Zam(G9). I had about +80 speed and normal crit chance/speed/crit damage modding + potency crosses. Restarted until dengar was able to block smoke screen. Went straight for the wookie with execute to prevent healing. Endless tries for nearly 2 hours. To make it easier I could have modded all except boba with maxed out potency (as I learned afterwards). Check the video by AhnaldT101 to get idea of the modding, and you can get it easier than me.
So yes, possible without bossk. Probably possible without dengar. Impossible without both. Expect to do a million retries with most of them ending before you get to do anything.
