1. “there’s only so much defenses can do” is a comment mired in massive ignorance. There are thousands of variations of defensive formations and alignments, blitz shows and coverage drops, zone coverage facades and robber rolls. You don’t know what you don’t know.
2. it’s not “an achievement” for coaches if their teams start slow, just as it isn’t for coaches whose teams start fast—that obviously followed from my post so you’re willfully misreading it or just don’t understand (again).
3. of course every team scripts plays they think will work; the point is that day specific information in a sport with massive injuries and fluctuating performance accrues massively in importance over priors after several drives.