> plans to bring up to 40% of our undergraduates to campus, including all first-year students, for the fall semester. Assuming that we maintain 40% density in the spring semester, we would again bring back one class, and our priority at this time is to bring seniors to campus

I'm not sure what exactly is achieved by having 40% density if that decreased density isn't evenly distributed. Unless I'm misreading, the incoming Freshman classes will all be at 100% density.