I dont think that is the case.
I think its mostly plot.
By Part 1 hype + current abilities.
Sakura have but the uchiha to shame.
With her genjutsu affinty, perfect chakra contol, sharp eye's, and keen eyes.
That in conjuction with her byakugou reserves.
As Kakashi said, if you can perfect your chakra control she should be able to master any jutsu.
And she learns jutsu instantly.
I think its mostly plot.
By Part 1 hype + current abilities.
Sakura have but the uchiha to shame.
With her genjutsu affinty, perfect chakra contol, sharp eye's, and keen eyes.
That in conjuction with her byakugou reserves.
As Kakashi said, if you can perfect your chakra control she should be able to master any jutsu.
And she learns jutsu instantly.