Congratulations. What an insight. Anything that helps one of us, may help others. I'm a recovered stutterer too who had multiple TBIs. My stuttering had nothing to do with the TBIs or improper diaphragmatic breathing, nevertheless recovering from TBIs can be a bitch. I recovered through psychotherapy. My stuttering was caused by latent anger and resentment from an abusive childhood. It was emotionally caused. It took 65 years to end my mild-moderate stuttering. There are various causes of stuttering, physical and emotional. You and I were just fortunate to find our solution. I hope the near future will provide answers to many others. Sue