Luckily for Kahu and his side, the shock 18-18 draw with Scotland on Saturday didn't come back to bite them.
"Obviously we were disappointed in our performance as a group," he said.
"Not taking anything away from Scotland, but internally we were pretty disappointed.
"By putting in that performance on the field we kind of gave the ball to Australia and it was in their hands for us to make the final.
"We were really luck they beat England."
The Kiwis will now have to beat Australia on Sunday morning - something they haven't been able to do in their last three encounters.
If they can, it will be their second consecutive Four Nations final win against Australia, and their third title.
Kahu also had a message from the entire Kiwis organisation saying staff and players wish everyone in New Zealand affected by the earthquakes all the best and they hope everyone stays safe.