Maybe the broker = the other ?? The THING IN JAMYL'S HEAD !
It's a possibility. It would explain why it wanted Insorum (*cough*MacGuffin*cough*) so badly. Another explanation is that he just wanted to make a tidy profit, another that he wanted to limit the Other's power by freeing Jamyl from her Vitoc addiction. The most likely scenario is that it is Grious using Jove tech to manipulate the situation, and vastly underestimating his opponents. Another possibility, considering the links to Gallente militarization, is Roden.
Regardless, it's all pointless to debate. The Broker is definitely a MacGuffin. He is who he is, and it's easy enough to cast any number of characters into his role as the situation justifies. His motives have very little to do with conventional logical reasoning, and he represents something that stands in opposition to the old Ishukone CEO's benevolent philosophy. The fear and hate directed at him is poorly explained, there's no real explanation given as to his past with Ishukone, etc. The "old enemy", this green-eyed monster, the one who orchestrated Gariushi's death? He represents Greed in a literary sense. Same with Roden, the same with Sarum. There's another green-eyed character in Empyrean Age too.
The Broker is completely separate from 514 though. The fact is, the lorespinners at CCP are finally putting a carrot at the end of the stick; I want to know more, and there's just enough clues to get me thinking but not enough to ruin the payoff (and it's not
completely MacGuffin of the Week scenarios). They are using characters that, in this new context, make sense. These four individuals are the
only ones who can change the course of events, and showing their perspective is necessary. Unlike Empyrean Age, using them to move the plot is justified. We now know the major players, their particular stances, and have a general idea of where they will go next in their journey.
Anyways, 514 will be revealed in time, I'm sure. It couldn't possibly be as simple as an organic chemistry reference.
I'm almost 60% sure of it.