It's certainly true you can use a Hubitat Pico to control any Caseta stuff (in addition to most non-Caseta stuff too) via programming in Hubitat, but I've never been able to use a Pico that was programmed via the Caseta app to control Caseta stuff to also then additionally do non-Caseta stuff w/in Hubitat.
But perhaps that is possible somehow - I've certainly been wrong before.