They really fucked me specifically over by not showing Sam in the daddy jacket at least once. Imagine how badly it would fuck with Dean seeing his brotherhusband in his fatherhusband's jacket, not to mention how Sam would actually fill it out properly, which is good symbolism for Sam being more like John than Dean is and also for him taking over John's role in Dean's life.
Dean would have so many complex feelings about it, like he would be unbelievably turned on but also oddly grief-stricken and maybe feel kind of guilty about the fact he has replaced John with Sam in a context where he and Sam didn't get together until after John died. Guilty because he feels like it's some kind of betrayal even though John is dead, but it's more in the sense that he recognises the only person who could come close to filling the hole John left is Sam because he's his brother, because there has to be that multilayered, deeper connection and codependency between them which he couldn't get with a man he isn't related to. Guilty because he recognises he's just perpetuating the fucked up dynamics John groomed him into, and instead of being free of it now he is dead, he can't live without it and has moved on to Sam, and he does love and want Sam but what if he's just using him to fill the daddy void inside him?