In thinking about deletion in federated wiki, it is useful to think about the case of transclusion.
Many times I may want to delete something from my server not to remove it, but to return it to Blue Halo Status. This allows the page to default to the latest updated version of whoever is highest in the link resolution context and relieves me of Forking Duty.
Showing deletions as a ghost page, when linked from my server, would defeat that. Showing ghost pages off of journal would be fine.