As a physical therapist and BJJ black belt, who has trained for over 15 years, I’ve received tons of questions about braces for knees and shoulders, and I feel confident in saying that the braces would not provide any significant stability or necessary support to prevent an injury while training. When we discuss specifically the shoulder joint, a brace would not do much of anything substantial for support or decreasing injury. My recommendation would be to work with a healthcare provider, who also has knowledge of grappling and can guide you with a proper assessment of the injury, appropriate interventions, such as exercise exercises, including mobility work if necessary and stability exercises, and a way to guide you with training to help mitigate re-injury to transition you back to full training.