Those findings did not explain the All Blacks' inability to convert that domination. They had chances and either muffed them, were repelled or ignored dropped goal chances.
Barnes was a 28-year-old rookie ref at the 2007 RWC who had begun his test career only the year before so his quarter-final promotion was a significant and surprising decision.
"My beef isn't with Barnes so much as with his inexperience," said McCaw. "This was Barnes' biggest game by far.
"On the big stage, an inexperienced referee is likely to become so afraid of making a mistake that he stops making any decisions at all.
"By the end of it, I thought Barnes was frozen with fear and wouldn't make any big calls."
In the wake of the massive RWC upset, Barnes received internet death threats and widespread personal abuse.
World Rugby said criticism of him was "completely unwarranted" while the tournament refereeing was the highest it had ever been at a World Cup.
"New Zealand losing that game was not all about the forward pass," referees' manager Paddy O'Brien said. "I think it's a disgrace and people have to grow up."