Ok I will concede to those points. But how are the corsairs proposing to mine said resources? As I said, big capships need allot of material. Corsairs will need allot of mining machinery to get crete's resources out. The corsairs simply don't have the manpower to fight their current wars, mine resources and build massive cap ships. If I recall correctly they have relatively low life expectancies. They may want someone else to do it for them. Like IMG.
As for the proposed take over of rhiendland, it is what you might call a long term goal.