12 casings are .223. Nine dead. Easily enough right there for the police to have killed all nine people. AR15 rifles are very easy to hit with at short range and very likely fatal with a center mass hit.
From the autopsies last year.
Manuel Issac Rodriguez, 40, Allen, one gunshot wound in the head and one in the back. Head: Medium Caliber NOT from police .223; Back: Medium Caliber NOT from police .223
Matthew Mark Smith, 27, Keller, one gunshot wound in the back and one in the abdomen.
Back: Medium Caliber NOT from police .223; Abdomen: Not Determined
Jesus Delgado Rodriguez, 65, New Braunfels, one gunshot wound to the head and one in the back. Head: Medium Caliber NOT from police .223; Trunk: Undertermined
Richard Matthew Jordan II, 31, Pasadena, one gunshot wound to the head. Head: Medium Caliber NOT from police .223
Richard Vincent Kirschner Jr., 47, Wylie, one gunshot wound to the top of the head, one to the left knee and one in the buttocks. Knee: Medium Caliber NOT from police .223; Buttocks: Small Caliber .223 or .22
Wayne Lee Campbell, 43, Fort Worth, one gunshot wound to the head. Trunk: Small Caliber .223 or .22
Daniel Raymond Boyett, 44, Waco, shot two times in the head. Head: Medium Caliber NOT from police .223; Abdomen: Medium Caliber NOT from police .223; Head: Undetermined
Charles Wayne Russell, 46, Tyler, shot once in the chest. Chest: Small Caliber .223 or .22
Jacob Lee Rhyne, 39, Ranger, shot once in the neck and once in the abdomen.Neck: Undertermined; Abdomen: Undetermined
Spaz. Arm: Not Available ... yet!