Siebe asked: “When underlying tendencies activate, do you reckon this to be vaci and kaya sankhara or mano sankhara?”
Yes. Vaci and kaya sankhara arise DUE TO underlying tendencies (asava/anusaya). We can also say that Vaci and kaya sankhara arise DUE TO our gati.
I have talked about this briefly in recent posts. I will refer to this, again briefly, in the upcoming new post. It will be elaborated on in upcoming posts.