Then again, during the fall of the samurai, guns were more advanced then this RPs time. Although, cannons are a great source of pre-battle devastation. c:
A lot of corporations would use both legal and illegal means, I believe, however since Red Cross is the cover-up for the Knight's Holy Cross they'd probobly use both methods.
The Knight's Holy Cross is filthy rich aswell, but they're an entire orginization. And Arthur is not the head of economy, someone beneath the High Priest is.