Just improve your observation and you would be fine
My observation is fine but I am wondering if names can be misused later on.
Also, I dont think there are any rules preventing users to use any username they want.
That the whole point of this thread, should this be prevented by forum or it left to the user to be smart enough to understand than we still can have impersonator of famous personalities.
If real Nick is registering with his own name then I guess he will publish his key/signed message to confirm the identity. If he need to remain anonymous then there is no need to use his own name.
I think it should be prevented from forum but it will become burdensome for the forum.
End user should verify these things but I doubt that all of them will be that smart.