Because he knew naruto was too strong for sasuke. And also he knew naruto naruto wont fall prey to sasuke's overall jutsus. -ameno? foot speed negg diff
-chidori? base rasengan counters
-enton chidori? base rasengan counters again
-genjutsu? ibtch please
-pain's path? he survived pain twice
-amaterasu? a rookie samurai survive that "hotter than the sun" jutsu for more than 30 seconds.
the aforementioned were what hagoromo considered and then decided not to tell naruto of the potential threat he faces
-chidori? base rasengan counters
-enton chidori? base rasengan counters again
-genjutsu? ibtch please
-pain's path? he survived pain twice
-amaterasu? a rookie samurai survive that "hotter than the sun" jutsu for more than 30 seconds.
the aforementioned were what hagoromo considered and then decided not to tell naruto of the potential threat he faces