I found another pic that supports your theory:New (to me) info regarding the WDW Attic.It appears that the 1996 Attic re-do was somewhat more extensive than I initially thought. It seems in the original WDW Attic All the pop-up ghosts popped out of some kind of trunk.
When the Attic was re-done in 1996 all the trunks were removed and the Pop-up Ghosts now dressed as Groomsmen just came out of holes in the ground like in the Graveyard Scene.
I can't believe it took me that long to notice that.
Also found this really detailed shot of part of the WDW Ambrose Tableau for potential future exploration.
~ the attic ~ | Flickr - Photo Sharing!
Another factor in the "Kids or no Kids in the Mansion" argument has appeared in the Disneyland Mansion as what appears to be a dollhouse has been spotted in the Ambrose Tableau at Disneyland.
Haunted Mansion Attic Dollhouse | Flickr - Photo Sharing!