In recent years Rich has been interviewed a number of times about the Tongue Controlled Embouchure. Listening to these recordings could give you some insight into the TCE system and the ideology that surrounds it.
Trumpet Gurus Hang, 2021:
Positive Trumpeters Worldwide Live Stream, 2020:
Trumpet Player Portugal Interview, 2020:
Discussions with Tristan Button, 2019:
https://www.youtube.com/watch?v=-WGKbocmAC4