It' s the highest potency opener from all the simulations I have done. Important thing to note: If you plug this opener to the Excel doc made by the Reddit guy, you will get a wrong result because the spreadsheet doesn't take into account WAR's "Maim" and hence it doesn't buff anything with Slashing Resistance up until casting Yukikaze. We are pretty similar to HW Ninja in the sense that our opener will depend upon WAR applying the Slashing Debuff for us so that we don't have to start rotation with Hakaze-Yukikaze and lose potency.

The rotation is not perfect yet and I still have to run multiple simulations with what we learned here. However, if we can say one thing for certain is that Hakaze-Jinpu-Gekko-Iaijutsu (Higanbana) is the best way to start our opener, and then opting for Shifu-Kasha combo, leaving Yukikaze for the end since "Maim" will still be up. So now you have a basic foundation to build on. Where you put Hagakure and Meikyo Shisui in the opener will be the deciding factor.