[MicroBob]

seems pretty obvious to me.
If there's a guy who has played only 2 tournaments in his entire life on AP and won them both then it seems plausible that the super-user account has access to these other accounts' passwords and has determined that they are completely dormant and that the real owner is extremely unlikely to return or notice that their account was played on. Might even be just a play-money acct that played one time like 3 yrs ago perhaps.
So he is able to win 1 or 2 tourneys on the name that has practically never been used before, never play that account again, and dump the funds to someone else where he can get the money.