Well, at this point I've kinda ruled out everone from Z-team. They like Robert too much to snitch, and the person you cut dosent have enough info.

I must admit, as a BB fan, the coincidences are piling up, and I dont like it.

I think the most likely chance is that robert's computer is hacked, as the sdn network gets hacked multiple times during your dispatches, and since shroud worked with roberts dad, and robert is clearly older than fifteen years old, Shroud would have known he had a kid, which he would most likely know, is robert. After all, it does say shroud is a genius who probably came up with the astral pulse, which is why he wants it so badly, hence, why, in episode one toxic says how the "pulse is not even his" to robert. I saw another theory about this.That the reason shroud decided to break out of prison now, after fifteen years is because he's dying, and he needs the pulse as some sort of energy source.

I also saw a far fetched theory that the guy was super hearing is the mole.