They have to be here for a reason. They know things the hero doesn’t know, and she certainly has question she wants to ask them. They’ll have some advice for Pete — what they told him already was pretty good, but they have to know something about Lauren and maybe Jake and maybe Molly that they would tell him, too. They’re here for a reason . . .
. . . maybe when /not telling/ almost dies at the end. Maybe when /not telling/ DOES die at the end — they could have some information related to that. Or something that Brian asked them to pass on.
They’re here. It has to matter. It has to matter. It has to MATTER. A lot. Much-loved ghosts do not show up for nothing.