@eng1
the problem they have it that's ALL they know, they don't know how his ability works, they don't know what his current limits are (though thanks to miss power up tool they do know he has no true limits, but I doubt they realize what that actually means). there's a hell of a difference between:
knowing he can somehow "raise the dead or something like that" and he's f***ing strong
and
knowing he extracts the mana from a being and constitutes that into a shadow replica that has all of the original's abilities, can equip MC's gear, AND grows stronger over time the more it fights. that shadow extraction can fail depending on the strength of will of the target and time since death (though they might not figure out the time thing given he just raised a dragon that'd been dead for years) or if the target's mana was excessively corrupted. and further more that MC's legion of the shadows he successfully raised becomes completely loyal and is essentially indestructible as long as MC is able and willing to supply more mana. they surely don't know he can raise more shadows than he can save, that only making calling or reviving shadows requires mana and they can exist indefinitely without further cost as long as they aren't destroyed, or that he can fight with melee, assassination techs, telekinesis, and magic in his own right on top of his shadow based skills. and while several people suspect he can grow stronger in his own right, no one has proof he's anything more than the most powerful double awakened person ever with a growing army of shadow soldiers. and that he's been dragged into the middle of a war between monsters and angel like beings, a war which is about to spread to the whole world.
yeah, bit of a difference there...
and, sure, there's a couple people out there who survived incidents he was involved in and thus know little bits of what he can do, but most of them are korean, probably don't understand what they saw, and aren't telling anyone about what they saw anyways, let alone giving that information to the US hunter guild.