The second proposal is an attempt to think about what kind of coverage and play calls lead to more injuries. … It turns out, at least in the data set, when there was double coverage on gunners, the play was a little more dangerous. There were significantly more injuries. It’s not exactly clear to me the mechanism by which this works, so while getting rid of double coverage on the surface should reduce injuries by a third, in practice I’m not sure. Because maybe there are some other underlying factors that are causing coaches to call double coverage on gunners. Maybe there’s something else I didn’t observe. So this one is worth trying out, but then you want to measure it and see what actually happens. It could be something they try in the preseason and see if it reduces injuries. If not, then maybe it’s not as robust a recommendation.