Well they have clearly played the game before taking their six weeks to making legend, but....
It's not against the rules to create a new account, WGT ask you to inform them that you have a new account to shut down youre previous one. So unless you know the player in question has'nt, they may have acted within the rules, and done nothing wrong.
Point is there's nothing wrong with playing the game on a 'new' account, if WGT's rules have been followed.