The point is, the Lions have a history and some success in that history albeit long ago. They also have a geographical reason for existing.
The Jaguars I don't get. They're not the first team in Florida. Heck, they're not the second team in Florida. And some might argue, well, that corner of Florida is different from Tampa or Miami. OK, but, like, not every streetcorner gets a football team. Stockton probably feels it's different than SF or Oakland but we don't give them a team. How does one live in Jacksonville and not have formed some basic attachment to Miami or TB by the team the Jaguars came about? Or Atlanta? Or one of the myriad of college football teams in that area? And then it's not like they have a great history during their existence to pull someone over. At least the Panthers in that time made it to a couple SBs. The Jaguars had, what, a fleeting appearance in the AFC CCG? What exactly gets one exciting to wake up in the morning and root for Jacksonville? Do you have to literally be the mayor of Jacksonville and have this be your city's claim to greatness?
Same with Houston, but I guess they have the excuse that Houston is the fourth (I think?) largest city so of course they *should* have a team. But between the Cowboys being the Cowboys and Texas having no shortage of college football teams, it feels weird anyone would identify so closely with them, again given the lack of success in such a short time. You have to really buy into some Houston/Dallas cultural rivalry that I suppose must exist but damned if I know.
Chargers get honorable mention. You had some claim to uniqueness by being in San Diego, but threw that away to be the crap team in LA, where roughly/oddly only 12 people care about pro-football.