I woke up the other morning with that thought in mind. You know how this season they keep going to Oliver standing in a cemetery in front of a grave and vowing to Barry Allen that he's going to kill somebody? We're all assuming that he's vowing to kill Damian Darhk, the big bad of season 4 and the man responsible for Felicity being paralyzed. But, what if it isn't Darhk? What if Oliver is talking about somebody else entirely? We know that Oliver makes the declaration six months after the season four premiere, but for all we know, that's when the season ends. I'm starting to think Barry's presence was merely a red herring to make us think that Felicity was the one in the grave, but of course she wasn't. So who do I think is the target of Ollie's wrath?
Malcolm Merlyn or an as yet to be introduced baddie. I think it's Malcolm because of all the damage he's done to Thea. After all, he's the one who drugged and used her to kill Sara Lance, which caused Ra's al Ghul to go to war with Team Arrow. This in turn led to Ra's mortally wounding Thea and the latter developing a blood lust after being dunked into the Lazarus Pit. Thea can't break the curse because Ra's is already dead and because she refuses to kill in order to satiate the blood lust, now she's dying. The promo I saw for tonight's episode implies that despite the profession of love he has for his daughter, he's actually okay with her dying. I mean, didn't Malcolm start the war so he could become the new Ra's al Ghul? If Thea's the one in the grave, then that gives Ollie more than enough reason to want to kill him.
As for it being a new baddie, it makes sense if the grave yard scene is taking place at the end of season 4 and whoever Ollie wants to kill is the big bad for season 5.
So, who's in the grave? I have a few guesses: Lyla Diggle, Quentin Lance, Donna Smoak, Thea, or Oliver's son (and man that would be BRUTAL). It could also be Felicity. I know we saw her in the limo after Ollie left the grave and she told him (while crying) to kill whoever Ollie is determined to kill. Buuuuuut how do we know that that's actually Felicity and not some figment of Oliver's mind. I mean, he's clearly wrecked emotionally, so it wouldn't be far-fetched if he's imagining things. Plus, if Felicity is dead, it would be a total and absolute mind frak and the fandom would lose its collective shit.
We'll find out sooner or later.