I’m too lazy to do the first part but I imagine it’s like this:
[Dean walks into the room.]
DEAN: All right, let’s do this.
SAM: Well, shouldn’t we wait?
DEAN: Wait? Why? We got everything we need. Everything else is just burning daylight. Come on. Let’s make this prequel.
SAM: All right. I’ll gather my gear.
DEAN:Uh…hold on. I’m doing it alone.
SAM:What?
DEAN:Look, prequel’s tend to ruin canon and character motives. And, there’s no telling if this thing will even get off the ground. Okay? Somebody’s gotta stay true to the source.
[Miracle walks into the room]
Miracle: woof [And I’m coming with you. I could use the screen time]
SAM: The prequel might only give you one scene. And you know the fandom has pretty much hated this idea since day one, right?
Miracle: woof [A part’s a part and I’m a dog. I just got to look cuddly. No one hates cuddly animals.]
