JHU, WashU, and GTech just don’t do very well in Forbes “American Leaders” ranking (successful people in business, government, non-profits, arts, media, and sciences), which is the biggest component in Forbes. Not sure about Caltech. Again, it could be that when a huge chunk of the student body with the most potential at JHU, WashU, and Emory enter med school, they don’t contribute as much to those other fields. Possibly true for all those engineers at Caltech and GTech as well. UChicago does fine in that ranking. Arguably, they are higher in USNews because they have gamed more heavily than peers in recent years (Chicago use to sit around 10-15 in USNews, which is about where Forbes has them among RU’s).