Although you receive this quest from Dzaga he will not spawn until you have talked to Churrlan at the Sunspear Great Hall. After accepting the quest, lead the corsairs to the rendezvous point. At the quest marker, wait for Sakku to spawn. After a short dialogue, all of them will turn hostile and start attacking. Kill Dzaga and Sakku to complete the quest. It is not necessary to kill all the smugglers. Note that both named corsairs have a large pull distance and are not grouped with anyone else, so they are very easy to pull.