Board Thread:Lore Discussion/@comment-103.193.59.119-20170508025131/@comment-29832152-20170521070531

The Imperial bloodline was born from Akatosh's pact with Alessia, and so while they were of the Dragon Blood it is unknown if it was the exact same thing as Dragonborn. It is concievable that Akatosh specifically bestowed the full blessing/powers of a Dragonborn specifically on the Last Dragonborn and it will not breed true. Considering they don't re-use old roles for future MC's, then our Dragonborn is if nothing else the last one that's likely to directly appear in any of the games.