To use your same dubious “editorial we” tactic — “others here” on FR have “pointed out” NUMEROUS other accounts of what happened before the arrest, during the arrest, in the van, and after the ride that are at loggerheads with the simplistic set of events you postulate
Go look for yourself.
Yes, others have pointed out other possible accounts of what happened - namely, that Gray intentionally hurt himself. But that’s just speculation.