Board Thread:General Discussion/@comment-26489974-20150711090925/@comment-26509603-20150726211538

Adish2004 wrote: Kai, Jay, Cole, and Zane never had their airjitzu forms.

That was just a promotional thing (like their NRG minifigures). The Ninja couldn't really create their own suits. It was just a way to influence people to buy the Airjitzu Flyers.