If it wasn't for Boruto training under Sasuke and learning to fight like him Kawaki would have probably killed Boruto just like he killed his father.
Meaning:
If Naruto trained Boruto = Dead Boruto vs Kawaki
Sasuke training Boruto = Strong enough to fight Kawaki
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Meaning:
If Naruto trained Boruto = Dead Boruto vs Kawaki
Sasuke training Boruto = Strong enough to fight Kawaki