In the "Shadow Souls" Damon says that the story (of him and Stefan) gets told and retold but everyone misses something. Any theory of what that might be?

Chapter 34.
"There is something everyone has missed you know. About the archetypal story of how two brothers killed each other simultaneously and became vampires because they dallied with the same girl.
[...]
There is something you all missed. Ha. Maybe even Stefan has missed it. The story gets told and retold but no one catches it"


So, what that might be?