Hey guys
thought i would make a thread about this as this is a re-occuring theme throughout naruto that kishi uses,and if we go by this it can answer several questions (theoretically).I will give some examples and if you think you can add to it please do
comments much appreciated 
sakura>tsunade
First i'll start with sakura and her becoming a medical ninja and gaining super strength just like tsunade.I believe she will become a better medical ninja as she has shown that she is very capable of this with her fight against sasori and healing herself as she pulls his katana out of her.
Sasuke>itachi>orochimaru
Sasuke followed in oro's footsteps by leaving the village in search of power as did oro,in the same situation with jiraya trying to stop him from leaving but failing just like naruto.I believe if we follow this theory of the generations sasuke will sacrifice himself for his village(in a way by this i mean save naruto in the dying moments i.e. jump in front of him)
naruto>jiraya>minato
Naruto as we know has become the sage and inevitably will become the hokage(just not yet),where jiraya and minato failed to defeat madara and pein naruto will succeed.And where jiraya failed to get the girl i believe naruto will...in the end
shikamaru>asuma
shikamaru has the intelligience to surpass that which asuma had,he was also offered to join the 12 monks,he is going to be the child of asuma's mentor and sensei.He has taken up smoking and I believe he will play the same role as asuma in the future.(so he won't become hokage as people have mentioned)
kakashi>minato>white fang of konoha
I believe kakashi will follow in the footsteps of his sensei minato and give his life protecting the village,i also believe that a new light will come about telling the truth about the white fang of konoha and the reasons for what he did.(all in all i believe kakashi will follow the footsteps of minato and become the next hokage eventually naruto will be next but i believe kakashi will have a spell first.)
izuna uchiha>madara uchiha
I believe in my opinion that if we follow this trend that izuna beat madara as sasuke did itachi (this is just my opinion) i believe tobi is izuna.I believe something may have happened to madara in the fight between the 1st or the 4th which would lead to izuna wanting revenge (this would go in sync with sasuke wanting revenge for what happened to itachi and his clan
)
All in all this is just my idea based on the trend of the generation surpassing/following in the generation before thems footsteps as kishi is so fond of
tell me what you guys think (try not to be to harsh) if i've left anything out or you think you can add anything to it please do 
sakura>tsunade
First i'll start with sakura and her becoming a medical ninja and gaining super strength just like tsunade.I believe she will become a better medical ninja as she has shown that she is very capable of this with her fight against sasori and healing herself as she pulls his katana out of her.
Sasuke>itachi>orochimaru
Sasuke followed in oro's footsteps by leaving the village in search of power as did oro,in the same situation with jiraya trying to stop him from leaving but failing just like naruto.I believe if we follow this theory of the generations sasuke will sacrifice himself for his village(in a way by this i mean save naruto in the dying moments i.e. jump in front of him)
naruto>jiraya>minato
Naruto as we know has become the sage and inevitably will become the hokage(just not yet),where jiraya and minato failed to defeat madara and pein naruto will succeed.And where jiraya failed to get the girl i believe naruto will...in the end
shikamaru>asuma
shikamaru has the intelligience to surpass that which asuma had,he was also offered to join the 12 monks,he is going to be the child of asuma's mentor and sensei.He has taken up smoking and I believe he will play the same role as asuma in the future.(so he won't become hokage as people have mentioned)
kakashi>minato>white fang of konoha
I believe kakashi will follow in the footsteps of his sensei minato and give his life protecting the village,i also believe that a new light will come about telling the truth about the white fang of konoha and the reasons for what he did.(all in all i believe kakashi will follow the footsteps of minato and become the next hokage eventually naruto will be next but i believe kakashi will have a spell first.)
izuna uchiha>madara uchiha
I believe in my opinion that if we follow this trend that izuna beat madara as sasuke did itachi (this is just my opinion) i believe tobi is izuna.I believe something may have happened to madara in the fight between the 1st or the 4th which would lead to izuna wanting revenge (this would go in sync with sasuke wanting revenge for what happened to itachi and his clan
All in all this is just my idea based on the trend of the generation surpassing/following in the generation before thems footsteps as kishi is so fond of
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