In terms of explosive, offensive output, Alabama football has changed much, going back to the 2014 season. Tua Tagovailoa, when finally unleashed by Nick Saban, demonstrated how explosive Crimson Tide offense can be.
Unfortunately, when at less than full health, Tua-led, Tide offenses were not explosive enough against Clemson and LSU during the last two seasons. In those two losses, Crimson Tide failings were on both sides of the ball. Looking forward to the 2020 season, a Tua-less Tide may not be as explosive as the 2018 and 2019 teams at their offensive best. Being somewhat less explosive offensively might be fine if the Alabama football defense of 2020 is decidedly better than 2018 and 2019.