[[Gray did this to himself, most likely so he could file another lawsuit. Unfortunately for him, he overplayed his hand.]]
That very likely is exactly what happened- however, proving it will be difficult in the courtroom- as will disproving it
Fortunately for the officers, the burden of proof is on the prosecution. What little forensic evidence has been leaked, the bolt and preliminary toxicology report, and the statement of the passenger, seem to support the theory that Gray was in large part responsible for his injury.