**SPOILER ALERT**
OK, I just reread Redemption, and if there's one thing I can take from the graphic novel about Feron's character, it is that he is not someone you can trust. Throughout the series, Liara constantly questions Feron's allegiances, as he reveals that he's not just some contact, but has ties with the Shadow Broker, as well as ties with Cerberus, and that his very actions are shady (e.g., pretending to miss Tazzik's ship).
This is just my theory (which I readily admit that I have no proof of), but I think that for whatever reason at the end of Redemption, Feron wanted Liara to think that he was dead. However, instead of Liara moving on, she made a personal vendetta on the Shadow Broker, that she maintained for the next two years. This eventually leads Feron to resolve this matter, so he "leaks" information to Cerberus on his whereabouts, which then causes the events in the Lair of the Shadow Broker DLC. When Shepard and Liara find him, Feron then urges Liara and Shepard to finish off the "Shadow Broker" (who was INDEED his subordinate or "pet") so that he can be freed. If you noticed, when the Yahg is defeated, Feron kind of "vanishes" when the light flickers. However, instead of Liara being done with her vendetta and moving on, she again surprises him by becoming the "new" Shadow Broker. Immediately afterwards, Feron states that he needs to "check the power supply" and heads off (I'm guessing here that he secretly reprograms the drone to identify everyone in the room as Shadow Broker, instead of only him). If Feron was the real Shadow Broker, he could have also manipulated the dossier information to make Liara think that the Yahg was the Shadow Broker.
Yes, I know, it is a very far out theory. But honestly, who fits more as the Shadow Broker, a feral, shield-wielding monster-alien, or this guy.
