The hunters you have are all useful, though that squad composition isn't really optimal for anything. Might work on a toppled raid boss I suppose. I would use Embo lead for now unless you have a specific need for Aura's stealth and your Cad is tough enough to take the heat.
You should definitely add Boba and Jango when you get chance. Boba is real easy to farm. Jango takes more work but is on the same node as Hounds Tooth which you will also want.
So again, the question is what are you wanting to do with them?
Embo lead is the best of the ones you have. Also, if you have zBossk at G12 and 4 others at at least G11 you don't need Dengar to unlock 7* Chewie. Yes he makes it easier, but Bossk makes anything BH-related easier overall. Better uses of guild currency than 7* Dengar for one event. You already have him at 5*, however; so it's up to you.
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Other than that, really depends what you are trying to do with them... ?
You should definitely add Boba and Jango when you get chance. Boba is real easy to farm. Jango takes more work but is on the same node as Hounds Tooth which you will also want.
So again, the question is what are you wanting to do with them?
In general you want Bossk to tank and for Chewie specifically you need Dengar to prevent R2's smokescreen.
What he said