Marnus FC stats are far lower than his test stats, so may not necessarily be the issue.
My issue with moving Marnus to open is you then move Smith up to 3, possibly exposing him further... also throws out the balance of our batting lineup as our best 3 batsmen (who are miles above the rest) are then the first 3 batters and exposed to the most difficult time to bat.
And why do all this just to accommodate a 35yr batsmen for a dead rubber test.
Even after Uzzie drops out of the team possibly after next summer... who do we then have to come in at 3 or 4?? (who should ideally be your best batsmen).
Or would we then just chuck Marnus back to 3, which is the most likely scenario, but would probably happen after failed experiments with Head, Maddinson, etc. getting a run at 4 first.
It's mentioned a lot that ideally your best batsmen should be at no. 3 and 4, and we've stumbled onto that.
A good no. 3 is just as hard, if not harder, to find than a good opener, so I dont see why we should be looking to move ours up... who also just happens to be the no. 1 batter in the world.