In TWO of my posts, I stated how the Skyline GT-R has the advantage thanks to the 4WD and the wet track....even if the track was not wet, the 4WD still helps the car stick to the road.
BMW325i, as I stated before, the Skyline GT-R was intentionally thrown in there as the better car. Its purpose was to be the camera car so it had to be better than the others so it could deliberately keep a close eye on the Z.
The results of the video are no big deal. It's not going to slow down M3 sales just because the M3 didn't win. All of the cars on the track are great sports cars and I know my opinion on any of them did not change based on who won, who lost, etc.