To start things off I'm not much of a "know it all" about this type of stuff so please correct me if I'm wrong. So the other day I was watching The Arrow, it all started on Season 2 Episode 7 i believe it was.
Near the end of the episode Digg searches the acronym H.I.V.E. which immediately got my research going.I then looked it up myself and found some great discoveries. It turns out that H.I.V.E. is the Hierarchy of International Vengeance and Extermination, in other words the knockoff League Of Assassins and is said to be led by Damien Darhk. After doing even more research I then find out that Floyd Lawton AKA Dead-shot was payed by an unidentified woman from H.I.V.E. to kill Andrew Diggle. That would explain the reason why Dead-Shot couldn't tell Digg who payed him to kill his brother.
When I heard the name brother blood in this I immediately thought of teen titans to be honest. Plus they have H.I.V.E. in it as well so why not the teen titans or one of them show up in the arrow or flash. But then they use the name Cyrus Gold...yep rings quite the bell alright, Solomon Grundy and Oliver Queen fought head to head only for Oliver to burn half his face off and kill him.
I'm far too tired to finish this article so lets just call this Part 1 shall we...