J2's performance was amazing! Although, I suspect it wasn't all performance. After all, they were also saying goodbye to working together every day. They are professionally going their own ways. There were moments that it didn't completely feel like Sam and Dean -- like when Sam says he can't do it alone Dean smiles and says, "yes, you can." I know that is a call-back to Dean saying he can't do it alone in S1. I recall Jensen saying that Jared has been torn up about the end all season, it felt like him reassuring Jared that he can do it alone. That he will be right there with him in his heart. Maybe, I'm completely wrong, but I'm liking this head canon anyway so I'm keeping it.