Weems, the zanna with a Zeppelin shirt who can play sick air guitar, specializes in alcoholic parents and looks like he walked right out of 1983. I know a lot of people think he was Ash’s zanna, but consider this:
What if Weems was Dean’s zanna?
What if Dean had Weems for such a short amount of time before he ‘didn’t need him anymore’ that he simply can’t remember him? Weems didn’t acknowledge Dean because a Zannas job is to do what’s best for the child and, in Dean’s case, not reminding him of his stolen childhood is the best thing.