"An enemy of an enemy is a friend—that principle is certainly correct.
Now for the Organization of Water, Satan as an ally seems a bit too strong.
Too weak, and they can't take down Deyo; too strong, and they fear Satan might go overboard and take out Steve too, then the Organization of Water's efforts would be for naught—a true case of 'the chickens have flown, the eggs are smashed.'
The problem with lying low and waiting to reap the benefits is that you can't control the force of the blow without getting your hands dirty.
"Where is Black Devil?"
Brian finally spoke. He frowned and said, "Why is Black Devil not involved in such an operation? From their conversations, it seems that Black Devil has a very close relationship with Satan."