Board Thread:Questions and Answers/@comment-24578352-20140222115942/@comment-8472350-20140224221044

Basically, Iwato-san's ability distributes the tiles such that she will only draw one suit + honour tiles, and the other players will get the other two suits + honour tiles. Because of this distrabution, everyone thought that the dead wall would contain the remaining tiles of Iwato-san's suit, since that makes the most sense mathematically; however, when Saki began declaring kans, it became obvious that the dead wall contained the other two suits, and not Iwato-san's suit. I wouldn't consider this a weakness, but it's definitely something that only Saki can specifically exploit.

Basically, Saki can still win even under the pressure of Toyone's Pursuit Riichi and Iwato's suit magnet because she her main ability is to get Kans and Rishans.

(By the way, the rules state that you can't have an Ippatsu Rishan)