Uchihas are capable of pure love, but when it's corrupted they gain godlike power from their hatred. How do you control this in an environment that is full of tragedy and war trauma, where strength is rewarded?
Only those who are direct reincarnations of Indra receive the god like power. Sasuke’s dad had Ms and we wasn’t all that
 

Darui does it, fodder Shinobi do it against Madara. I think Aoba does it too. It’s not an impressive feat in Shippuden
Ok but it still doesn't answer the point. It's the amount of water he can use without a water source. Not the fact that he can use water jutsu without a water source. So again there are a few people that can usee water jutsu without a water source. However the amount isn't alot that they can perform. The only ones that single handedly perform large amounts of water in their water jutsu without a water source are

Kakashi

Mizukage

Kisame

Everyone else had low quality or amounts and this who did it in the war had to combine all of their men using the justu together to even perform a big wave of water
 
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