I just went to this page: http://stackexchange.com/leagues/1/week/stackoverflow
And it shows this user: https://stackoverflow.com/users/123387/justin-van-horne as top for this week with 758 points of reputation for this week.
However, it wasn't active for a long time and didn't get any reputation in this week at all.
The reputation league thing is probably just a caching issue, because he just lost points for a deleted question. He gained +758 points on an answer migrated yesterday, but then subsequently deleted it.
The answer was on Why does this PNG image display differently in Chrome & Firefox than in Safari and IE?, which looks like it got bounced from SU then back.
