If the user has achieved a high rank in the forum, and choses to change his username, will the account be suspected of changing hand and be tagged for that? If yes how will other users know he is still the rightful owner?
Only the forum Administrator has that privilege, The Admin will not change your username because there is a change of hand, because we are known here based of our posting behavior , our posting behavior history and accumulated feedbacks are what associated us to our username.
And if there is a change of username, there should be an announcement of request so the community will not be surprisedd of that username having their feedback on that account.