You aren't the writer either.
The only way Sasuke surpasses Naruto is if he becomes a bigger legend. Which I doubt. He isn't Hokage nor are the legends written about him.
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How is a master surpassing a legend?
But it seems like to me, you can't accept Boruto surpassing Naruto and Sasuke. I can, after all, the trailer says it.
I accept Boruto saying Sasuke surpassed Naruto.
So why can't you accept this?
Legends aren't always the most powerful. They just did a deed that stood out in history.
Kaguya=bringing peace during a turbulent era
Hagoromo=spreading ninshuu
Ashura= Founding the Senju Clan
Indra= Founding the Uchiha Clan
Hashirama= Co-Founder of the Leaf Village, and started the village system
Madara= Co-Founder of the Leaf, and rivaled Hashirama
Hiruzen = Learned all the Jutsu in Konoha (supposedly)
Sakumo= Rivaled the Legendary Sanin
Minato= Army solo artist
Seven Swordsmen= Wield famous swords
Etc
Etc