Writing in The Australian, Ella opined that the Sydney-based Waratahs were a "big team in a big city and that requires a big-name coach."
Gibson's contract with the New South Wales Super Rugby franchise expires at the end of the 2020 season and Ella believes the current Wales coach would be ideally placed to take over.
"The word in Europe is that Gatland will not get the England job after the World Cup in Japan later this year, which means his only ongoing commitment will be coaching the British and Irish Lions in South Africa in 2021," Ella wrote.
