However in terms of industry e.g. planets, civilians, factories. I think that would begin to fall apart without Dooku or Sidious... still, he'd have more industry that Mandalore and could still invade Dxun
I don't really understand this argument.
Grievous is at the height of his power, and attacking (what looks to be) a much smaller foe. Why would anybody be unhappy? Also, does this mean the Grievous gets the Sepratist War council, such as Nute Gunray? Because that only helps him, not hurts him.