Anybody can't replace Sakura...they need her perfect level of chakra control in order to inherit Tsunade's jutsu
Kishimoto intended her to be a normal person...thus the lackluster back-story about mundane things such as bullying and having a childhood crush. From her fight in the chuunin exams part of it also seems to have been wanting to step out of Ino's shadow.
You use we a lot...but i don't really agree with you.
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On serious note Get over the hate for a drawing dude