zBossk is great, but if he's stunned or the rest of the team is under-prepared, it's not gonna help. Mine was g12+3 (including a fsr piece) with both zetas, and he didn't survive the encounter. In fact he got a taunt off, then died before taking another turn.
Dengar is also great, but it's a bit of luck even with him. On the run I cleared he didn't get critically hit, so R2's smokescreen went off anyways. He makes you less reliant on RNG (and is a great healer under bossk lead), but he's not necessary. No one is.
