Shisui is different from other uchihas

[Vapid]

He said something about straight lines and how it a great power. And if anybody is go to have the strongest eyes it Sasuke.

He said "I can feel it... Your Mangekyou is...a straight comma. I can see why you move so well. Until my Rinnegan comes back...I guess I could take your eyes."

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Nowhere in there did he say anything about the Sauce having the strongest Mangekyou (which he doesn't).

 

[Dark Magician]

He makes it seem like the more straight lines the stronger the eyes.

 

[Vapid]

He makes it seem like the more straight lines the stronger the eyes.

Where are you getting straight "lines" from?

 

[Parrish]

Madara>>>>>Shisui

Captain obvious over here.