In the Stack Exchange Reputation Leagues for Super User, Ignacio Vazquez-Abrams is listed as a "user for 7 months", and has 13k+ rep for the year, but he isn't listed at the top of the "Top New Users" list on the right.
It seems like in some places, calculations are based on when the account was first created or first had a question migrated in from elsewhere, but in other places, it's based on when the user started actually posting from the account?
Over in SU chat we figured out that maybe he had a migrated question in 2008 (!? Before SU existed?) that he never "claimed" (never created/linked his accounts), and then perhaps he finally created his account in 2010?