User blog comment:Xilinoc/Ch. 549 - The Stormbringer/@comment-8438917-20130919133830/@comment-4957813-20130919135813

Thing is, Xil said she never used it after the Yoruichi fight andall the movies are NOT canon, and therefore, not considered part of the Bleach timeline. Ergo, Soi Fon has not yet used Shunko until this point in the plot ever since her fight with Yoruichi.