If we can use Oblivion as any sort of comparison, it's likely that the Dragonborn of lore in the future games will have done EVERYTHING they possibly can. Maybe even small little things that seemed to mean nothing, will have a small easter egg in the future games.
Right now, we have nothing but speculation. So you shouldn't use absolutes like "Lore wise, the DB didn't..". It should be "I think, lore wise, the DB didn't.."
Excellent point. Nothing is set in stone yet. We still have some more things to look forward to I think!