Every gap report is unique. Four patterns show up often enough that when I see the symptoms, I know where to look first.
1. The lane gap
Owner believes the marquee line prints. Books show a sleeper line beating it on GPPCD. Identity tax.
2. The rep gap
Owner believes the board-topper is the profit engine. Books show the mid-board guy with higher net per lead.
3. The lead-source gap
Marketing swears by a channel. GPPCD by source shows another channel prints — or the sworn-by channel fills the schedule with dogs.
4. The build gap
Production believes callbacks are "about normal." Stated margin vs job-costed margin tells a different story — slow jobs eating crew-days.
None of these require genius. They require permission to compare belief to books without shooting the messenger.