The Chief Justice isn't in control of whether the court takes a case. Only 4 justices are needed to grant cert (though for high stakes cases generally a side will only grant cert if they have 5. That's likely why the court turned down all of those 2A cases).
But now there's a 5-roberts-3 balance on the court. Whichever way he swings, it probably won't matter.
The Chief Justice isn't in control of whether the court takes a case. Only 4 justices are needed to grant cert (though for high stakes cases generally a side will only grant cert if they have 5. That's likely why the court turned down all of those 2A cases).
But now there's a 5-roberts-3 balance on the court. Whichever way he swings, it probably won't matter.