The organisation will continue a trial in tomorrow's match between the Hurricanes and Waratahs in Wellington whereby the match doctor will be given a television to check for signs of concussion injuries after collisions.
The issue has led to some commentators saying that coaches should take more responsibility as they have more access to game footage than anyone else.
But Blues coach John Kirwan said doctors were still the best placed to make the decision on whether to withdraw a player.
"There are screens everywhere so our doctor sees that stuff and our doctor has responsibility for everything," he said. "If we notice something afterwards and [the player] has passed his [concussion] test then we need to say we think he's off his game by 5 per cent and we need to reassess it. I think the grey area is when they pass their test and they go back on ... I think if someone is knocked out and we can all see it, that's the test, I believe."
In Kaino's case he was clearly dazed in the match against the Lions but passed a test and played on after doctor Stephen Kara was unsighted and didn't see the loose forward stagger.
Kara later told the Herald if he had seen Kaino's reaction he would have taken him off straight away.
But Kirwan was in no doubt as to the best course of action. "It's a doctor issue and we need consistency around a whole lot of things with Sanzar at the moment. We need to get some consistency on the ruling on concussion."
