My brain is still stuck on that whole letter grade thing. I have this silly theory about why the letter grades are based so strongly on the final sector visited - what if the game gives you a letter grade for each sector which relates only to that one sector, but it only shows you the last one? Like, it keeps overwriting it, because either they meant to display all of them and never coded a way to do that, or there was a miscommunication between the UI designers and the programmers, or the UI was originally going to be different and include a spot for each sector to have a rating? When you think about it, no sector appears to be related in any way to any of the others. All seem to be handled independently. Your retrieval/rating/etc in one sector appears to have no bearing on subsequent sectors. So, why should the grades be any different?