“The reason there were 4 bullets to the right arm was not due to “shooting to wound”, but due to having a blown eye socket due to a knockout punch from a 275 pound thug.”
And possibly jerking the gun in a high stress situation.
Or he had too much trigger finger on the trigger.
During all my training over the years the instructors would always teach that if you have more than the first pad of your finger on the trigger then when you pull the extra muscle force draws the weapon down and to the left (if you are right handed).
The arm hits on Brown coincide to that theory as the arm wounds went from bottom to head (my supposition from my training) as Brown got closer to the cop. As the target got closer and larger Wilson adjusted his aim up to keep with where the center mass was located in his sight picture.