Why Naruto Was So Weak After The Timeskip

The timeskip before Naruto Shippuden was suppose to come along with much stronger characters. That happened for some like Sasuke and Sakura, but Naruto, the main character, was kinda weak after the Naruto timeskip. Why would Kishimoto do that? And why would Jiraiya not make him stronger during their time training together? Become a member to get cool perks:    / @dygoknight   Like the video! Subscribe to DygoKnight:    / @dygoknight