from your posted link;
“There’s some reason to believe that (the shooter) came to this location with another individual. And there’s reason to believe the other individual would in some way be involved,” he said.
covert op making sure he got to the spot on time and kept fired up to do what they wanted?
I read he took a cab and walked into the store with the cab driver to get money to pay his fare. Is this the “other individual”?