If we're talking about the running game, Alabama just has different style backs. Alabama wanted Fournette, they didn't get him, but if they did LSU would be in trouble and everyone on Alabama's schedule would be in trouble.
Mind you, I'm not disparaging Henry or Drake, they're great, but Alabama has been missing a true power back and that's exactly what he is. He can make his own holes. Remember when some teams couldn't stop Ingram even though they knew he was going to run? The OL is part of that but so is the style of the runner.
In terms of Kiffin and the offense... the one thing that I think I'm not sure has been completely worked through is Kiffin's philosophy. I think he not only wants a TD on every drive, he darn near wants it on every play. I think he's plenty good at being an offensive coordinator, but the question is can his goals mesh with the Saban's and with what he has to work with? Last year it worked because he had some highly skilled players on offense with big play potential, this year the defense is the best attribute and figuring out how to best compliment that might very well be the thing that the offense needs most.