Kane pleaded guilty to one charge of manslaughter and four charges of reckless driving causing injury.
Edwards' trial in September took five days and the jury deliberated for three and a half hours before it returned a unanimous guilty verdict.
He was also found guilty on three counts of inciting and encouraging the driver to operate a vehicle recklessly, thereby causing injury.
At the time, Crown prosecutor Mary-Jane Thomas said Edwards had an "active part" in the driving.
"His presence and remaining in the vehicle ... in fact encouraged the driver," she said.
"This defendant wasn't an uninterested spectator, sitting in the vehicle ... he was having a ball, he was enjoying himself."
Thomas believed Edwards "overplayed his level of intoxication".
However, his counsel Fiona Guy-Kidd QC said the Crown had failed to prove his liability, saying he never encouraged the driver.
She said Edwards was "telling the truth".
"If he was lying about these blackouts, wouldn't he have come up with better lies?"
Guy Kidd said none of the witnesses or any evidence verified Edwards was in the car when Kane was driving dangerously earlier that evening.