The experiment nobody repeated.
The #13 slot.
Slot #13 of 39 in the Amazing Race Editor's Canon. Family Edition's problem sits inside the format itself, not around it. Season 12 runs the franchise's standard two-person shape cleanly and loses ground only to a tightened, strike-era production calendar — an outside constraint, not a design flaw. Family Edition's four-person teams never fit race mechanics built for pairs, and the franchise has never tried the configuration again. That is exactly the kind of result this methodology rewards: a season that permanently narrows what the format is allowed to attempt outranks one that merely reruns an idea already proven, which is Unfinished Business's ceiling as the weaker of the franchise's two returnee outings. The experiment failed, but the failure settled a real question. A competent rerun settles nothing.