For the most part, though, Root struggled in the winter when the likes of Ryan Harris and Peter Siddle pitched the ball up.
But Atherton said Root was ready.
"I thought Root played really well at the dying end of the test at the Gabba; I thought he looked really solid," he told Sky.
"He also dealt with all of the verbals. It was a very intense passage of play and his angelic smile seemed to disarm Mitchell Johnson as well."
However, former Australian test captain Ian Chappell and ex-England skipper Nasser Hussain are advocates of Bell, 31, who was man of the series in the winter, scoring a century in each of England's victories.
Hussain said Bell, who has long batted at No 5, is a classic first drop who can solidify England's top order.
"Bell is a high-class, experienced player with lots of touch. He's got runs against Australia of late and he is the obvious man to move up to number three," Hussain said.
Jonny Bairstow shapes as a logical No 6, unless Zimbabwean-born Gary Ballance can find some form in the tour match at Alice Springs.
However, England greats Atherton, Michael Vaughan and Steve Harmison all believe the man to come in on a drop-in Adelaide Oval wicket should be allrounder Stokes.
"If they did play Stokes at six, and if the pitch looked very flat, that would give them the option of bringing Monty Panesar in and playing a second spinner, with Stokes as the third seamer," said Atherton.
- AAP