Sports Tom Izzo was asked who could defend Zion Williamson. His answer: ‘Khalil Mack’ March 31, 2019 Nate Scott, For The Win Comments Off on Tom Izzo was asked who could defend Zion Williamson. His answer: ‘Khalil Mack’ Michigan State coach Tom Izzo was asked who could possibly guard Zion Williamson. His answer was a Bears linebacker.