I’ve always found the idea of lineal titles to be amusing. The premise is pretty simple - sometimes, promotions close down and people leave as champions. Instead of just letting that title die with the promotion, it’s kept alive in the eyes of goofy fans like me who keep track of wins and losses in the aftermath.
For example, let’s use Strikeforce. Luke Rockhold was their last middleweight champion. He got beat by Vitor Belfort in his UFC debut. Belfort lost to Chris Weidman. Weidman lost to - guess who? Luke Rockhold!