Instead of being killed off, the writers could have easily had DD take Oliver, Laurel, Quentin hostage. In order to get back at Oliver, DD tortures Laurel and Quentin and ends up killing Quentin in front of Oliver and Laurel. Spartan and Speedy come in, Speedy faces off against DD and everyone gets away. Que Canary Cry where Laurel/Oliver reminisces on Quentin’s life.
Green Arrow and co. are hellbent on stopping DD, Black Canary has the opportunity to kill DD but doesnt since she wants him to spend the remainder of his life rotting in prison instead of granting him a quick death. Green Arrow decides to pull a Giles and kills DD instead since he knows that Laurel is a better person then he is. The season ends with Laurel deciding to leave Star City since she needs to find herself and what she feels life has in store for her. She quits the DA office, says her goodbyes and leaves.
Season 5 remains largely unchanged (I havent watched 99% of it so…

instead of all the honoring Laurels legacy, it is honoring Quentins. Quentin has always known that Oliver can be a better person and he doesnt want him to let that darkness take him over. Laurel Lane however has been MIA from Star City for quite awhile, the teamhasn’t really heard that much from her, they just know that she is traveling. She’s gone for the first half of the season. The team is fighting Prometheus and someone else (could still be Black Siren or maybe Cupid) with whoever about to kill Felicity when all of sudden
Black Canary is back baby! And there a couple of questions clearly needing answering…the episode ends and the next one picks up with Laurel and co. in the Arrow cave. Laurel is now a meta human due to Flashpoint. She has done a rebranding of herself, Laure Lance as we knew her is kind of dead, she goes by Dinah now. On her journey of self discovery she encountered a woman named Lady Shiva who mentored Laurel for almost a year and helped her hone her fighting skills. Black Canary is now a bonafied kickass and ready to get back to Star City. She is Olivers equal, she isnt about letting the past get the best of her. She makes a joke about how she spent some time at a cute little flower shop. Oliver asks her to join his team as his lawyer, she is now back in with the team both in front and behind the scenes.