Not sure how the Ford being ever so slightly ahead of the Corvette tells us anything here.
The actions of Mueller blocking / double move on the straight and then moving the Corvette wide into the dirty portion of the track attributed to the incident more than anything Milner did.
I guess Tommy's mistake was trying to pass him and Mueller's was trying to not let him. I agree, it was mostly a racing incident, once it got to the actual breaking zone.