Dengar sucks to gear, but he's an essential part of a BH squad. Once he's under stealth and payouts are activated, he can drastically increase damage output. He has a 60% chance to assist special abilities, and he then has a 60% chance to call another to assist. He also prevents any enemies from stealthing while he has stealth, which is very useful for both TB and TW ( especially JTR squads with R2). On top of all that, his aoe gives tons of regen under Bossk, tenacity down, ability block, and a lot of thermal detonators. Boba and Dengar also are your only people who can hit a contract target behind a taunt to get those payouts going.