Board Thread:Naruto Discussions/@comment-33229263-20171029171433/@comment-30323490-20171126195727

Because that's just the way they want to animate stuff. Naruto's KSM from the Last is also very different from the KSM from the war. It actually resembles more the initial nine-tails chakra mode that Naruto had before becoming Kurama's friend. Yet he clearly is using KSM. It's just the animation that throws a lot of people on the wrong ideas.

Even Kishimoto drew Naruto with full yellow skin in an initial colored version of the manga. It's pretty clear that it doesn't mean much.