At the Home Depot shooting there was a witness that saw two darker skinned men (whatever that means) in a white van that tried to quickly cut into his lane and leave a parking lot nearby. The eyewitness said they looked very agitated and he felt as though they were ready to get out of the van at the anger from not getting in front of him. They didn't wait for him, they quickly went around a chinese restaurant and out the back.

So we have atleast 3 people that saw him in the van and shoot from it, and one detailed witness that saw both their faces up close.