Why would you switch stances for ToD in the first place? It doesn't gain any damage in Crane and it already does Eminence in Serpent.
The situation for ToD is often press it now or never press it at all. It's not like you can be like "oh, this add is at 10% HP, let me switch to Crane, roll in, ToD, switch to Serpent and roll out again". If you can ToD something and don't need the chi right now, do it, but don't worry about stances for that.