After hanging up his whistle and straw hat, Nick Saban had a trial run in his new role as an analyst on College GameDay during last month’s NFL Draft. He was on set in Detroit for coverage and drew rave reviews for his performance alongside Rece Davis, Desmond Howard and Kirk Herbstreit. But as his new colleague adjusts to being behind the microphone, Herbstreit hopes Saban can impart some wisdom on the GameDay audience. Saban’s charisma stood out during the draft as he smiled and made jokes – something fans didn’t see much of during his 50-year coaching career. That’s part of the reason he re…