I guess if you know for sure that you are going to be cropping your images in post-production, then you might as well shoot in 1.6 crop mode and gain the smaller file size.

As a follow-up to the other thread, I just did a test in crop mode and C-RAW, and I could not fill the buffer in the R5 at 12 fps no matter how long I shot. The card was easily keeping up with the shot rate.