I figure this was the same mistake as the first other response, I made the same one initially when reading that comment and thought they were saying "B" was lower than it should have been, not higher than it should have been. How "percentile" actually works isn't something I've given any thought in like a decade or more, my first read was "top 15-20%" before going back and remembering it's actually more like "bottom 15-20%" (or more precisely something like "better than 15-20% of other takers").