Remember that "Deluxe" isn't a size class, it's a price point. We've had Deluxes close to the size of Voyagers before (e.g. Animated Lockdown) and Voyagers the size of Deluxes (e.g. Animated Lugnut) etc. People view them as size classes because usually toys within these price points adhere to a common size - especially during Beast Wars which originated these fixed classes - but it's never been a hard and fast rule. Yes, Jazz is the size of a Legends figure, but he is not at the same level of design or engineering as a Legends toy. There is an above-average level of complexity for a Deluxe toy. Contrast this with the Cyberverse Warriors which are closer to the size of a Warrior/Deluxe toy but waaaaaaay below that level of design and engineering.

IMO SS Jazz better justifies its Deluxe price point than any Cyberverse Warrior.