That's possible, yes, but is it probable? There's always the chance that others are working...how would you say...behind the scenes, perhaps. People who don't talk on here often or who prefer to keep their work quiet. Though if he is as dangerous as it seems, a group initiative may be more beneficial.
Weaknesses, perhaps. But if we detain a killer in this world, what do we do with him? He's a supernatural being, will the law enforcement of this time even be involved? Likely not. So then what?
Might I ask why people choose to filter against you?