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He went from being this popular kid around his friends and having a lot of friends that he can rely on to now only RELYING ON HIMSELF and taking everything upon himself.. that is the LITERAL definition of an AMAZING CHARACTER DEVELOPMENT.
Boruto is supposed to be a character who was born a Prodigy but THEN learns how to deal with losing a lot of the things he had, He went from this happy go lucky kid to being able to Instantly sacrifice himself for the greater good.. (2)