Yes but, there is no lock down until right before the green flag... When there is Q, you should have the bench back if the commish has it setup like that.....
If you are second guessing yourself replace the driver with any other driver from the group, not just the spare you clicked to fill a spot to save your form. I could only see all season that I was uselessly putting Bench drivers in my entry every week. And, the entry table in the database was pushing 3.5 million rows when it only needed to be tracking half as much.