I have been a Rams fan twice. I saw them defeat the Browns in a preseason game that benefited some charity (Fearsome Foursome era). It took place at the Coliseum. A blocked Browns punt sent the ball into the Browns end zone to settle the game in the final minutes. Then some scallawag moved the team to St Louis, and then better people moved it back to Los Angeles.

Aren’t all “teams” “of Theseus”? If the team remains in one city for say, 60 years, the people have changed over and over again. The stadium is probably different.

The academic ship is too abstract, I like the sport team concept. Name, ownership, coach, players, like you said stadium. I can't think of any immutable identity one of those teams has.