Among Alabama fans, opinions vary as to the best all-time Crimson Tide OC. How to fairly measure the accomplishments of OCs is a debate that leads to no exact standards. At the least, worth considering are offensive points per game, average yards per game, along with wins and championships. Because talent levels in rosters vary greatly, there can be no objective 'best' standard.
Stats can also mislead. Alabama's scoring stats in 2015 and 2016 were inflated by a total of 23 non-offensive touchdowns. Total yards per game does not measure scoring efficiency. Wins and championships result from offense, defense, and special teams. Any subjective ranking is mostly opinion but maybe the best way to rank.
Through the 1960s, to the extent Alabama Football had an offensive coordinator, it was Paul 'Bear' Bryant and his quarterback. The quarterbacks had broad responsibility. One example was a quick kick called by Pat Tramell. On the sideline after the kick, Bryant asked Trammell why he called the play. It was during the two-way football era, and the QB said he wanted to see how his line would do on defense since they weren't blocking anybody.
I judge that seven Alabama Crimson Tide OCs are worthy of consideration as the best. In chronological order, they are Mal Moore, Homer Smith, Jim McElwain, Lane Kiffin, Brian Daboll, Mike Locksley, and Steve Sarkisian.