A lot of people have done it without Dengar or Bossk even, but they mostly said the same thing: it would have been easier with Dengar. It can be done without him but it will probably take you a lot more attempts. Many people have said that Iggy is squishy and often died in the first barrage from the enemy. I would say gear Dengar to G10, maybe G11 if you can. He will be a much bigger help than Iggy and from what I've heard Iggy doesn't need to be highly geared for his ship in the Falcon event anyways.