Its not an easy questions when you start comparing across eras. For example, Joe Namath had 374 pass attempts while at Alabama, Ken Stabler had 303. By comparison, BY had 949. AJM had 1026. Tua and Mac had 684 and 556 respectively.
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The game has changes so much, even in the past few years when you consider that Mac basically played one season and yet had almost as many attempts as Tua had in almost two.
The ColdHardFootballFacts website did this for NFL QB several years ago, and they settled on the yards per attempt based on the idea that new schemes focus on short completions while decades ago, passes were longer with lower completion percentages.
Using that basic state the top 5 would be:
1 Mac
2 Tua
3 Jeff Rutledge
4 Bryce
5 AJ
If you change that to Adjusted Yards per attempt, which attempts to include TD and interceptions as factors, the top five change to:
1. Tua
2, Mac
3. Bryce
4. AJ
5. Greg McElroy
None of that counts for running QB, and none of the above accounts for longevity. Given that Mac only played a season and a bit, while AJ played 3 full seasons.
IF you add rushing TD to passing TD and sort that, you get a new list:
1. Tua
2. Bryce
3. AJ
4. Jalen
5. Mac
But this also indicates the changes in FB with the emphasis on scoring. For example, Joe Namath had 39 total TD, and GMac had 41, but I don't think anyone would argue the actual order in ranking.
What the data does indicate is that while you can pull some key names from the past into the list, the QB over the past several years (Hurts, Tua, Mac, Bryce) and even AJM are all among the best Alabama has had in its history. Unfortunately, you cannot measure intangibles in stats, and there is no way to account for what the QB was not asked to do, which is always going to hurt the likes of Trammel, Rutledge, Todd and even Stabler and Namath.
I would have loved to see Stabler or Namath running one of today's offenses. I suspect we'd see similar numbers to those we saw the past 5-6 years.