I might believe that version of events, if I did not already suspect that Tammy was buying pills from EN for months prior to the shooting. And if her daughter had actually had a drivers permit at the time, I might believe they went out to have an impromptu lesson. And if I didn't already know that the parking lot they were having the lessons, was also where EN dealt drugs. Too much of a coincidence, imo.
If I am out driving with my daughter, and someone pulls in front of me and threatens to kill me and my girl, I do not drive home and get my son. I call 911 and drive to a safe place, not to my home, where the suspect will know where I live.
Of course, now we know that they all already knew each other, so the whole road rage story is bogus.
EN certainly recognized that huge green Buick. He knew who owned that car. There is more to this story than the version that you posted allows for, imo.