Although these concerns are understandable, I'd argue that there is no easy way to hold a real fighter down when he wants to fight. And Garrett here undoubtedly is just that: a real fighter.
And as this great, inspirational video says: "What do we see in a reflection?" Are we looking at an individual with a disability, or someone with possibilities? If Garrett doesn't label himself, why should we?
Make sure you visit Garrett's fight to read more about a young man who is a role model for other people with disabilities, and who also have begun teaching MMA.