I can imagine Bramblesar walking into StarClan one day and seeing Tigerstar (if he didn't die) on the border of The Dark Forest, and Tigerstar whispers, "Come to the dark side..."
And Bramblestar just goes, "Nah. The light side has prey. And not to mention cats with souls." And just walks away while flicking his tail in Tigerstar's face like "whatevs." While Tigerstar silently screams in fury and digs his flaws in the ground.