The chicken sandwich wars produced a sandwich that is best understood as a spec sheet rather than a recipe. When chains competed to win the fried chicken sandwich, they were not competing on a secret; they were competing on four public variables, and the contest standardized all of them. The defining thing about a wars-era entry is that it is an optimized object: every component was tuned against a competitor's component, and the result is a sandwich engineered by argument.
The craft is the four levers, each one a battleground. The crust is the headline: a craggy, deeply browned shell built for visible texture and audible crunch, because the crust is what photographs and what the eater registers first. Under it, the brine does the quiet work, holding moisture in a lean boneless fillet so the thing survives the fryer and a closed bun without going dry, since a crisp crust over dry meat loses the comparison instantly. The pickle is not garnish but a deliberate acidic strike, placed to cut the fat of the fry and reset the palate between bites. The bun is engineered to disappear: pillowy, faintly sweet, often buttered and toasted, sized so it compresses to the fillet and contributes no resistance, because the fillet is supposed to be the only texture in the sandwich. Every chain's version is a different setting of the same four dials, and the eater's preference is a vote on those settings.
The variations are the competitive field itself, conducted through spice and sauce. The hot build lacquers the crust in cayenne paste hot enough to be a dare; the deluxe build adds lettuce and tomato to soften the format toward a meal; the spicy-versus-classic split is the same fillet under two sauce regimes. Each of those is a codified entry with its own rules, and each deserves its own article rather than being crowded in here.