Defense
A. Clark Lea is really dedicated to the job;
B. The defense responds to Lea and wants to make him proud;
C. The DLine(s) play ferociously great, allowing the LBs to shine;
Offense
D. Alabama's blitzing isn't as good or as smart as Clemson's was;
E. They stack vs Williams, and spy vs Book, trying to mimick Clemson's blueprint. But Kelly/Rees invent a few plays aimed at that pattern --- maybe involving pocket moving and quick throws out of that to the TEs. The blueprint requires the dbs to defend our receivers without help. Being faster, they can, but not necessarily on quicker throws. This could involve leaking Kyren out.
This is the opposite of 2012. Then Saban could game vs an unchanging target. This time Saban already thinks he knows exactly the blueprint to engineer, but Kelly doesn't have to remain monolithic --- since in most ways we have nothing to lose, "going for it" with novel offensive schemes should allow freedom.