It can tell you that certain teams have a huge drop-off in production, when comparing the best and 7th best players, such as Purdue and Houston. Obviously a big difference between Zach Edey and Ethan Morton (or Kaufman-Renn). The same for Houston, UConn, Gonzaga, Kentucky, and a few others. So, if these teams have issues with foul-trouble or injuries, their production on the court is likely going to suffer.
Whereas teams like Tennessee, BYU, Florida, and Oklahoma won't see a major drop-off if one of their most productive players is out - and they have rely on the 6th or 7th best player. Having a quality bench can be crucial for postseason success.