"It's almost home, isn't it, for him here," Larkham said.
"He's been away for a little bit but very comfortable here and I think all the guys are comfortable here.
"Quade had a great game, I think, for his first game in a long time. He was really energetic at training, really enthusiastic with the boys and we've seen that again this week.
"I think having that combination of Quade and Bernard together will give Quade a lot of confidence."
Larkham concedes the Wallabies have struggled to adapt to the new attacking structure introduced after the 3-0 series defeat to England in June, but believes they found "clarity" in what he says was their best training week of the year.
That could mean more ball for Israel Folau, who remains at fullback after coach Michael Cheika emphatically ruled out a move to the centres for his strike weapon.
"Everyone's in agreeance that he is the best fullback in the world," Larkham said.
"The challenge for us as a coaching group is to make sure we're getting as many touches for Israel as possible.
"We don't want to overburden him with touches but we certainly want to get him some touches in space.
"In attack we're just trying to tinker with his running lines and where he is on the paddock. Defensively he'll still do his job like he's always been doing."