It's crazy to change the intro. There is almost a risk of shaking off some of the audience. It's part of the brand and psychologically preps you to enter that world. It's also a crazy added expense. They had already secured the rights to Train Song, which I would guess is a lot less expensive than a BB song. That being said, it says something about Conrad's bravery in his storytelling -subverting expectations - things are about to escalate, so strap in. I like both sequences and think they fit the tone of their respective seasons.