You need a spinner to meet over rates given how long quicks are taking to bowl.
It's also good to have a point of difference when you have four quck bowlers including Marsh.
I would maybe not if I thought Smith and Voges could give us 20 overs and innings (if needed). But they probably can't. So Lyon gets the go.
O'Keefe and Agar are both off to a good start in the shield, which is good. Nice to have some pressure on the incumbants.
It's also good to have a point of difference when you have four quck bowlers including Marsh.
I would maybe not if I thought Smith and Voges could give us 20 overs and innings (if needed). But they probably can't. So Lyon gets the go.
O'Keefe and Agar are both off to a good start in the shield, which is good. Nice to have some pressure on the incumbants.