It's all very nice and fuzzy to have Smith around the team delivering advice and schooling the apprentices about the arts of test rugby as Paul O'Connell is doing with the Lions.
But O'Connell can't play with broken arm, Smith has passed the checks.
Even an 85 per cent fit Smith would do the early business for the Wallabies to help absorb the Lions and take some of the sting out of their play before unleashing Hooper.
Smith might have hurt his knee a while back but the man has warrior blood flowing through his teak frame, he understands the methods of heavy battles rather than lighter skirmishes, he is as born to test rugby as Richie McCaw.
New Zealand has tut-tutted about Sam Cane's production in the absence of Richie McCaw. The difference is noticeable. No fault of Cane, he is a rising work in progress while McCaw is readying for his 13th season of international rugby.
Hooper has played 14 tests and Gill 9 as they make their way into the maelstrom of international rugby.
Smith has seen most of it before and certainly experienced just about everything that can happen in the test arena. He can sniff the times to make his move, he can assist captain James Horwill with the tempo and decisions on the field and drive his teammates.
It's all about knowledge and expertise.
The Wallaby front row is accruing that with tighthead Ben Alexander ticking off his 50th test tomorrow to become only the fourth Australian prop to reach that milestone.
He joins loosehead Benn Robinson, Al Baxter and Reds coach Ewen Mckenzie in that select group.
Alexander dismisses talk about the perceived Wallaby weakness in the scrums as a hoary old topic while he nodded to the Lions scrum led by senior tighthead Adam Jones.
"He is as clever and as smart as a prop goes in rugby, and there are games played around the engagement and I'm sure he has plenty more up his sleeve. We have to make sure we are ready for what he brings."
There were multiple tactics which was why scrummaging was so much fun.
"Many think it is mind dullingly boring and bashing heads against each other but you ask Adam, there is a lot of thinking and a lot of tactics going on."