Dean without Sam is a much harder person to have around. There’s no soft edges to him, no room for compromise. Dean without Sam is far more dangerous, not in a good way. Losing his brother took a lot more out of him than anyone could have predicted. Finding Sam again in the story is why he’s the man he is. Sam got lucky when he saw the amulet. He wouldn’t have even been able to bring himself to scold Dean the way Walt did, freeing his arm.
If Sam’s going to show up, he’ll have to be fast… only two more parts. What will happen to Walt?