None of that matters. The kid was in police custody, unarmed. He wasn't mace'd, he wasn't pepper sprayed, he wasn't tazed, he wasn't held down by four or five cops and choked to death, he was shot dead.
He was not in custody. He and his fellow perp were shoving the cop back into his car. Sorry, but that kind of aggressive behavior, involving a 300 pound guy, should allow the cop to defend himself. I seriously doubt the cop could have physically restrained 2 guys simultaneously. Sad that the guy died but he chose to be the aggressor, not once (first with the store clerk), but twice. Being a thug didn't pay off here.