User blog comment:Saikou The Lewd King/Paradox list of AUs/@comment-26441687-20160522184341/@comment-26441687-20160523025146

It's explicitly stated that he didn't attack anyone, that's why. It's not until Luka and Ilias showed up that he went violent because they're angels. Someone who's scary but doesn't actually fight or cause any harm isn't going to cause that much of a stir.

And we can't say anything about what's happening to Angel Halo because it is conveniently not in your possession. Like, if we had it then we could be like "hey something's not right here" but we don't.

Of course it could also just be that he didn't assimilate with the Angel Halo in Paradox but eh. Who knows. The sword was also sealed away by Ilias until Tamamo recovered it so it'd probably be harmless for that period. We don't actually know when exactly Tamamo recovered the sword so it's hard to say how long it's been 'out in the wild.'