Generally speaking 5* guys come with a lot of fanfare and attitude of you should bend over for them. They are overhyped so to speak. They are more interested in the glamor and tend not to work as hard as a 2 or 3 star who really has to work to become a starter.
As the numbers show, the Super Bowl teams (your best this season and usually for several seasons) have more lower star guys. The guys everyone overlooks because they aren't hyped by ranking services, etc.
These guys generally put in more work to earn where they are. When you have a group doing this your team ends up better - as this data indicates.
It's why the Patriots are one of the best teams year in and year out with a bunch of no-names for the most part. Sure they have stars but not the number of stars the rest of teams have. The Patriots do more with less.