Kakashi said someone who mastered foot chakra control can master every technique

[Uverdore9]

Then why is every able shinobi who can walk on trees and water, not capable of using every technique, masterfully?

 

[SIR UZMAKIMADARA]

foot chakra control shows mastery over chakra control but i think kakashi just exaggerated his claim.

 

[Hag0r0m0 0tsutsuki]

It was a theory.

 

[Sauce]

I'm pretty sure that he said something along the lines of:

"If you are able to master chakra control in your feet, you can essentially master any technique, hypothetically."

 

[UnderTheRedHood]

You have a point. Back in part 1 Sakura did that best and still ended up with almost no techniques at all other then learning Byakugo