There are lots good football details, and Ryan's strategies for both the Cowboys and his own team are described in enough detail that I was a bit confused. This is always a good sign that readers who actually watch football will be enthralled! The premise of a middle school student owning a team as famous as the Cowboys is an intriguing one, and will appeal to readers who love to play and read about the sport.
For fans of Green's other books, like the Football Genius series, or readers who like Fred Bowen, Rich Wallace, John Feinstein, or Mike Lupica, Kid Owner is a slam dunk. Or a touchdown. (If I want to get my sports metaphor right!)