That might have been the case before Saturday's 36-13 All Blacks win over Argentina in the Fortinet Rugby Championship, but it wouldn't have been after.
And it was the same for anyone in the rugby world who wasn't familiar with the newest starter in the All Blacks' loose forwards set-up.
Blackadder was like the energiser bunny, never letting up in a non-stop display at Suncorp Stadium in Brisbane.
Blackadder said on Sunday, he wasn't feeling any ill effects from his effort in the heat, and speed of the game, especially remembering it had been a few months since he played a full 80 minutes.
“It was hot out there, a lot of sweat loss. It ranked with any game he had ever played in for sapping energy.”
Wearing the No6 jersey for the first time starting was something he would never forget.
The win was enjoyable and resulted from the preparation, the side selected had put in during the week, he said.
"We had a lot of fun, we got through some good content and a lot of work and, once you get out there playing, it's the reward for the week you've had," he said.
The environment was one where it was possible to learn plenty from players all through the squad.
"There're so many different opinions and different things. We're constantly having conversations and they're a great bunch of blokes that we always learn off," he said.
It was a follow-on from the influence Tasman team-mate, and All Black Liam Squire had on him during the early stages of his career.
"I always asked him questions and he was always willing to help so that was pretty cool with him," he said.
While he had frustrations with injuries over the last two years, it wasn't as bad as it might have been because it gave him time to do other things and to get better at his game.
"It's furniture in the game, we all have to accept we'll get an injury at some stage and, fortunately at the moment, I'm having an all right run with no injuries so just enjoy it while I'm having it," he said.
Scrum coach Greg Feek said Blackadder had provided a lesson for all aspiring All Blacks over how much effort he puts in to learn his role.
"I know that sounds like a bit of a cliché, but it's diving into it, and he's so clear about what he wants to do, and he never stops working with that.
"He's always doing extras whether it's little micro things of off-loading or jackaling the ball, or carrying the ball. He's so studious in what he does, and I think what you're seeing on the paddock is the direct reflection of the work that he has put in. The work he has put in is phenomenal," he said.
While there was internal drive, it was also clear that he loved what he was doing.
"I also think knowledge is power, and that gives you confidence so when you know your role you can enjoy it more," he said.