In the Void Quests on the First (The Hero's Journey/One Step Closer/A Bounty of Hunters), we learn that portals connecting a Shard to the Void are also known as 'Hollows'. During the Void Arc questline, several bosses use this same 'Hollow' term as a prefix (i.e. Diabolos Hollow). Does this signify that they had crossed over to the Source directly by means of a portal, rather than having just their souls transferred across by means of a vessel/contract?