Someone pm'ed this question to me earlier and I wanted to see what is everyone's take on this: "How can you claim your kekkei genkai but not your rank?"
For example: You're a reborn member that have reborned 3 times already but your current in-game rank is Genin. Does one fight like a Genin? Should one limit their abilities, their chakra reserves, the jutsus that s/he can do because they are the rank of Genin?
Sasuke could very well be considered a "Grand Master Uchiha" Reborn now, and he's still a simple Genin, having never actually completed the Chunin Exams.
1) He possesses Kirin, isn't that a 'pwnage' technique on its own account?
2) His chakra reserves aren't too shabby, being able to pull off consecutive Chidori's following his tranining with orochimaru.
3) S-Rank Raiton techniques. Not much of a limit there.
Heck, even the Sage of the Six Paths could've simply decided not to graduate from Genin > Chunin. Rank has Zero impact on the matter, in my honest opinion.
(Just because a Reborn may be a Genin doesn't mean they need to be weak like the stereotypical 14-yr-old moron with poor chakra control and a raspy voice.)