User blog comment:The ASL Pirates/The Supernovas Where Are They Now?/@comment-24769684-20150515090653/@comment-1940096-20150517195026

Two things. 1) Oda said Z and Film Z are not canon. 2) It doesn't have to be a current Shichibukai. It could be a former one. Even if it was Doflamingo that event isn't canon.