If that is true, and it seems likely, why were there so many reports from police of multiple shooters? You would think they would know about the beginning of the rampage given an officer was involved, and would not be reporting multiple shooters:
From the Midland Police Department, here
"Update * We believe there are two shooters in two separate vehicles. One suspect is believed to be at the Cinergy in Midland and the other is believed to be driving on Loop 250 in Midland. The two vehicles in question are: gold/white small Toyota truck and a USPS Postal van."
Police first thought there were two shooters because they were getting reports of shots being fired from two different vehicles in two adjacent cities.
Only later did they realize that the same perp had used one car, then ditched it and hijacked a mail van to continue his rampage.
So, two cities, two vehicles, but only one shooter.
There’s always confusion in the beginning. This was sorted out rather quickly.