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Notice how Iruka says she lack earth, but that's not the case anymore.
In a border sense ,
Naruto- earth, because of he represents the body of the sage due to his uzumaki heritage. But he only has the life force, and the yang chakra.
Sasuke- heaven, curse mark of heaven, Uchiha heritage grants him yin related abilities, those sharrigan jutsu.
Now Sakura is actually both, no background to restrict her, perfect chakra control, always balanced, originally a genjutsu type...yin user, but exceed in physical attack due to her senju teacher,. She has what the boys lack probably, the perfect chakra control, possibly some yin related strong will and genjutsu defense and her intelligence , and she has the senju body due to her seal, that's to Tsunade . What do you think?
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