Marsh has already scored enough to get picked again. He'll go on to average around 4 against the West Indies despite blokes like Smith, Khawaja, and Warner hitting tons every innings. And then in the shield you'll have people like Maddinson, Lynn, Klinger, Lehmann, Dunk, Stoinos, Maxwell, ETC averaging 50+.
Mitch Marsh just secured his spot with that cover drive.
The thing is that Geoff Marsh wasn't even a good player, he was barely decent (look at his stats, they would be inexcusable You this era. The only reason he played so many tests back then was because they had no one else). At least Wayne Pearce was a legend.
So who comes in for Starc? I guess Pattinson and it will be great to see him back, he is a genuine gun.
If Siddle's back is worse than first thought as well, who comes in? My pick is Bird, the guy in my opinion is a more consistent wicket-taking version of Siddle.