If you have “B” groups you have to put them on the correct holes. You have to put them on the holes after par 5s. I’ve had some years where I was a B group and the hole before us was a par 3. That group was waiting with us before we even teed off sometimes!!! If they double the holes after par 5s it gives them more time to get the B groups going without a backup. Not saying there won’t eventually be a backup but it does help.