Well in Rennie's opinion he thinks Holloway and Hanigan are going to offer more at 6 than Wilson, which is fair enough with their lineout prowess which is going to be critical against the NH. Samu was always going to maintain the bench loosie role with Hooper back. McReight is the pure 7 backup.
The only player I see in direct competition with Wilson's skillset is Gleeson. I agree it's tough to pick Gleeson over Wilson at this stage of their careers but Gleeson put in the performances for Aus A (and unlucky to Wilson for not getting a go) to push his case. He's clearly going to be a player for the future and even possibly the RWC next year and Rennie wants to get a good look at him (he's seen Wilson already).
Direct quotes from Rennie on the issue:
“Harry is such a good man. Langi edges him out because what he’s shown has been hard to ignore.
“We had him in (Wallabies) camp for a few weeks and he really impressed at training. He’s athletic, he’s got great feet, he’s powerful and gives you go forward in attack and defence.”
And just also some quotes why Beale wasn't considered too:
Leaving three-time World Cupper Beale behind made sense even if his hamstring may have repaired.
He’s played no rugby, he’s still rebuilding power in his body and recent parenthood has been a more pressing focus anyway.
“It was a tough call with KB (Kurtley Beale) but we want to make sure his body is where it needs to be when he makes his comeback. He dropped some kilos and is building those up again,” Rennie said.
“He can have a strong Super Rugby season and push from there.