This couldn't be one of those evil, cheating, last-minute remixes, could it?
The "last-minute" phrase is key here. Katy's remixes were released right at the exact week where she was at #2 and a bump in sales sent her to a #1 peak.
A three-day bump in sales this week for DWUW will not send the song flying up 16 spots on the chart. "Last-minute" and "cheating" do not apply here.