It's really too difficult to take down Djo.
Satan is formidable and now quite renowned as well, but no matter how powerful Satan is, it's still just a small mercenary group. Taking on an assassination task depends on who the target is. If it's an unknown small fry, it's naturally very simple. But if the target is Djo, then it's as difficult as climbing to the sky.
Let's just set aside whether it's worth mobilizing a mercenary group of Satan's caliber. If Satan had to eliminate a small fry, they'd just grab a gun and go for it. Even against IS's Badadi, didn't Satan just gather their people and went for revenge?
But dealing with Djo, that's different, very different.
