But just think about the implications of the Ganamede ploy for a moment. What did cybertonic get out of it?
1st. It consumed vast amounts of Imperial resources that would have been devoted else where (namely the asteroid belt).
2nd. It puts a spotlight somewhere else, other than where it could be (their shipyards, and their other planet they have that is one of Jupiter's moons, I forget the name).
3rd. Puts Imperial out there with them against the DL.
4th. The BH by default is forced to have a presence outside the asteroid belt.
But let's look at the Ganymede ploy from the Imperial point of view.
1.) It DID consume a vast amount of Imperial resources, but it then allowed Imperial to finally have a homeworld of it's own (Ganymede is the moon of Jupiter), while forcing Cybertronic out into the asteroid belt.
Before, Cybertronic was on the point of the solar system against a major DL incursion from Nero. Imperial, taking the moon of Ganymede, now is on that point, and as a fanatically loyal army that will fight to the last man. With Cybertronic on that point, with so much AI on the field of battle, the Brotherhood were nervous, and rightfully so with the history of the DL and technology, that the armies of Cybertronic would either turn or be shut down by the Symmetry.
Now, as you said, the Brotherhood is out there at the edge of the system as well, patrolling the solar system against the DL. This also places Cybertronic between Imperial, the Wolf Packs, and Capitol in case they are turned by the Symmetry.
In short, they may not be heretics, but they are surrounded by powerful forces that can overpower them very quickly if they fully commited.
B...
I think that made sense...(late...very sleepy)...