There is too.
Chapter 63 in Part 1. When Naruto fought the Rain Genjutsu all night while spamming Kage Bushin. As well as transforming into Kabuto, Sasuke and Sakura, and using his shadow clones to release them from the genjutsu, so Sasuke and co could trap Oboro's team at daybreak. Naruto then beat Oboro's team by himself.
All this was accomplished after Orochimaru put the Five Pronged Seal on Naruto's belly. Where the 4 Pronged Uzumaki seal for Kurama was. This cut Naruto off from Kurama's chakra and left him with only his own Uzumaki reserves.
Kabuto also says this in Chapter 63.
You must be registered for see images
So yeah, Kakashi and Kabuto got it right. Even without Kurama, Naruto would still be a tank.