It wasn't a Todd quote, actually. He was never quoted as saying "Jills". It was a journalist that mentioned it in one of the articles around their Utah event. Some people came to believe that Todd let it slip, since it was a very obscure connection to make (Akatosh has Jills, Akatosh is Alduin, the Dragons seem to be working for Alduin, thus the Dragons we see are Jills), but others believed the journalist knew their lore and put it together on their own since no other article mentions it.
As for the thread topic, there were some images leaked recently that has some relevant thoughts. Obviously can't link ot it, and I'm not sure it'd be cool to copy-paste what it says, but it essentially posits if being dragonborn was a prerequisite to wearing the amulet and lighting the dragonfires, or if wearing the amulet and lighting the dragonfires was a show of Akatosh giving his blessing (ie, they weren't dragonborn before wearing the amulet and lighting the fires, but became one when going through the ritual of coronation).
As for the thread topic, there were some images leaked recently that has some relevant thoughts. Obviously can't link ot it, and I'm not sure it'd be cool to copy-paste what it says, but it essentially posits if being dragonborn was a prerequisite to wearing the amulet and lighting the dragonfires, or if wearing the amulet and lighting the dragonfires was a show of Akatosh giving his blessing (ie, they weren't dragonborn before wearing the amulet and lighting the fires, but became one when going through the ritual of coronation).