Wow, that's a good catch! You absolutely do not want to use kassatsu prior to TCJ in that case. So now the opener gets an extra guaranteed crit raiton within trick attack + potion. Roughly:

Huton - Hide - Shadewalker - Raiton on the pull - Spinning Edge - Jugulate - Gust Slash - Shadow Fang - Mug - Spinning Edge - Gust Slash - Aeolean Edge - Spinning Edge - Gust Slash - Potion + Duality - Aeolean Edge - Spinning Edge - Raiton - Gust Slash - Ten Chi Jin - Fuma Shuriken - Raiton - Suiton - Trick Attack - Shadow Fang - Dream Within a Dream + Kassatsu - Spinning Edge - Raiton