There is no Doton in that "guide" for the AoE part... Which is a DPS loss.
Doton does 240 potency, and Koton does just 180. If Kassatsu is up, you should do Koton -> Kassatsu -> Doton. Yes, Doton crits....
Opener:
For the opener I just use the one MrHappy put up some days ago...
Huton(pre-cast so that you can use Mudras again after 2 GCD skills) ->
B4B + IR(Pre-cast right before) -> Spinning(DEX pot) -> Gust(Suiton) -> Dancing(Trick Attack) -> Mutilate(Kassatsu) -> Spinning(Raiton) -> Shadow Fang(Mug) -> Spinning(Jug) etc..
Don't know if it's optimal, but it gives you the highest possible damage output during the Trick Attack. If you don't use a pot, just weave in IR after your first Spinning Edge instead obviously...