When Dustin stood there denying a vote in favor of Eric, Zach should have immediately jumped in and said "It wasn't Dustin, it was me. I voted Kale out because I thought my only chance was to align with the numbers." It would have been enough to target Dustin. Eric would have been furious at Dustin for turning on him. Zach could have gone to Dick later and explained he said that to give Dick and Dani another shot at staying in the game.