Best case: Nick Saban's coaching staff overhaul works, and the Crimson Tide dominate college football in 2019. Tua Tagovailoa wins the Heisman Trophy. Jerry Jeudy finishes second and takes home the Biletnikoff. The offense sets more SEC records. The development of the defense is even more impressive. Alabama wins every game by two touchdowns or more in the regular season before blasting Georgia in the SEC championship game. Alabama gets Ohio State in the semifinal and ends Ryan Day's season before a revenge game against Clemson. In going 15-0, Alabama avenges each of its lasts three unresolved losses while Saban breaks Bear Bryant's record for national championships in the Mercedes Benz Superdome. He's carried off the field in a strikingly similar, iconic way.
Worst case: South Carolina stuns Alabama in triple-digit temperatures on Sept. 14. The season mirrors 2010 from there with losses to LSU and Auburn. Tagovailoa opts to sit out the Capital One Bowl, but the Crimson Tide still beat Michigan State. It's a three-loss season, and a frustrated Saban contemplates retirement after watching Georgia and Clemson in the championship game.
Source : https://www.sportingnews.com/us/ncaa-football/list/college-football-2019-best-worst-case-for-every-top-25-team/1j10vft6i9uuc1obd4j88x3qyx203