Chairmen Of The Boards

Photo by Patrick Smith/Getty Images WASHINGTON, DC - MARCH 31: Zion Williamson #1 of the Duke Blue Devils grabs a rebound against Xavier Tillman #23 of the Michigan State Spartans during the first half in the East Regional game of the 2019 NCAA Men’s Basketball Tournament at Capital One Arena on March 31, 2019 in Washington, DC.Rebound margin rarely has been a focal point for Mike Krzyzewski’s clubs, as is perennially the case for coaches at, say, North Carolina. But lately balances have shifted in Durham, and not only because so many of Duke’s players are like ships passing in the night, here and gone.

One significant difference at Duke has been greater use of zone defenses. Those…