I found the hardest tier was tier 5, and in this tier you need finn, vet chewy and scav rey. I had rey at g11, finn at g8 and vet chewy g9 with fairly good mods and finn would die too easily. You ideally need him at a higher gear lvl and I managed it without his zeta
BB8 is only used in the first few tiers and solo is fine at g8, but bb8 is so good in a JTR team with R2 he is for sure worth spending time getting to g12 with zetas.
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Discord: Iona Starbound#5299
Finn G10-G11
BB8 G8 (might as well try to max to get use in other areas)
Vet Han G8
Vet Chew G8
I would take Finn, Rey, and BB8 as high as you can since they play good roles everywhere else in the game.
BB8 is only used in the first few tiers and solo is fine at g8, but bb8 is so good in a JTR team with R2 he is for sure worth spending time getting to g12 with zetas.