Dude, you really need to give up you're John!issues. Seriously. Those flashbacks were not all about John. Yes, they were talking about John, but absolutely everything was about SamnDean. It was about how much Dean hated lying to Sam, but at the same time, how desperately he wanted him to just be a kid. It was about how much they need each other, and them knowing that they mean the world to each other, that they are the most important thing in each other's lives. It was about Dean trying so hard to give Sam a real Christmas, even though he's a big ball of angry preteen. In other words, Show is all about subtlety and what's going on below the surface...LOOK CLOSER! :-p