Pretty sure Rachel was voted to finish by Mycock's backers (people on Patreon) and not, script-wise, dependent on Rachel being finished. Even were that not true, Rachel is not required for the scene, and having two renders, one with her present, and one with her not, is a waste of resources compared to doing it the way it was done. Not sure if it can happen in the morning, but if so, it almost has to work this way.