Re: Arrow / The Flash / Supergirl by Informant
In theory, I really like the idea of this season. In showing both the start of Oliver's journey as the Hood and bringing in a villain directly borne from his sins is interesting. It shows some of his growth, but the show has been so inconsistent on whether or not Oliver even sees a problem with killing bad guys. I honestly can't say whether or not he thinks that.
Batman has his "no kill" rule (which he breaks all the time), and while Oliver seems more Batman than Superman, I think Oliver's "no kill" rule is more like Clark's. I think he avoids killing when he can, but I don't think he has any particular problem killing if other lives are at stake. For example, if the Joker were Oliver's arch-nemesis, I don't see any reason why Oliver (the Arrow version, at least) wouldn't put an arrow through his heart and be done with it.
That would also separate Oliver from, say, Dexter (of the show of the same name). Dexter has to kill, and he actually does use his "monster" to only kill people who "deserve" it. Oliver may enjoy killing, but I think he only enjoys killing bad guys. If push came to shove, Dexter would kill a good person instead of not killing. There's no indication that Oliver has anywhere near that problem.
I think a more interesting twist would've been a revelation that Robert Queen's list was a fake or a forgery of some kind. That many of the people he killed were innocent. I don't know if that would possibly jive with season one, but the idea that the catalyst for Oliver's entire journey would be built on a lie would be interesting.
One other thing that's been bothering me. Susan found evidence that linked Oliver to the Bratva to the Green Arrow, who showed up at the same time Oliver did. But that's not right - the Green Arrow has only been around two years - the one who showed up at the same time as Oliver was "The Arrow" or "The Hood" - and the official story is that he's dead. Oliver even references it when he declares himself as the Green Arrow.
So as far as Susan should technically be concerned, the bigger story is that Oliver was both the Arrow and the Green Arrow, and that the Arrow and the Green Arrow are the same person.