to expand a bit, ansible runs on its own, but can be controlled from teletype (via app specific ops, so we have kria ops, meadowphysics ops etc) or can be used as a teletype CV expander (so you get extra 4 CV and 4 trigger outputs).
ansible is not required for grid/teletype integration.
but grid/teletype integration is great for creating teletype scenes that serve as meta controllers for ansible (or trilogy modules). so you could have one grid connected to ansible running kria, for instance, while another (perhaps smaller) grid could be used with teletype to execute additional kria commands.