Yes, that's the "rule". If you have page [1 exist]<--[2 exist]<--[ ]<--[4 exist] then the page "[4 exist]" don't have a bread crump to previous (since no such page exist), only the page "[2 exist]" will have a link to "[1 exist]".
Yeah, I figured as much. Thanks for the clarification though!
Nevertheless, I still need to figure out a way to "repair" the pseudo-subpages whose (pseudo-)parents did content in the first place...
-- F.