"I think the autumn really showed that there's nothing between the north and south any more," McCaw said. "
"You look at South Africa losing to Italy, Wales and England, the Aussies losing to England, New Zealand to Ireland. I actually thought there was very little between the teams before but that reinforced that."
McCaw said he was quite pleased he didn't experience the All Blacks shock loss to Ireland in Chicago, their first ever defeat to the Irish.
"In a real selfish way I was relieved I wasn't out there at the final whistle because that would not have been enjoyable in any way," McCaw said. "Some of the skill and tries that the All Blacks have produced have been a step up from what I was involved in, but Ireland managed to stop those moments and made it tight. When they got one or two chances, they were nailing them."
If England go through the Six Nations unbeaten they will break the All Blacks' recent tier one record of 18 test wins on the trot.
McCaw is predicting the defending champions will make it all the way to the final match against Ireland on March 18.
"I would be surprised if it didn't come down to that game. It will be really tough for the English if they get to that point with their record intact. There will be a lot of pressure on them and the Irish would love to knock them over. Wouldn't that be an amazing day?"