They intentionally skewed it that way. Playoff teams are exempt.
Partly as a reward for making the playoffs and avoiding the distraction (as new head coach teams are exempt too), but a big part is bad teams are more interesting. The show doesn’t follow the superstars, it follows the rookies and the vets who may not make the roster. I think Kazee may be the star of this year’s show. Guy on his last leg, coming off an injury but not necessarily a pro bowl player when he was healthy, does he make the 53? Hard Knocks eats those stories up. Backup QB is a great candidate too, hard knocks star could be its own thread.
There’s a reason the Bengals have been on repeatedly, the Rams have been on repeatedly, The Browns and Lions and TB before this season are always eligible. What kind of intrigue and drama do the Colts have? Or the Steelers? The Patriots? The car going the speed limit in its lane and signaling every turn attracts no attention.