corrupting a planet does not give the cons the planet in fact you said it best
the planet is partially weakened and/or gives a part of their income to the consortium - leaving them weakened for a Consortium military takeover?
that is right and to answer your other question the campaign is only consortium
Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.