[Omnikaiser]

I don't really see what is so different about the ending yeah.
The ending is even a reference to kuuga/the first heisei rider to me.

Both the main protagonist and main antagonist become basically the same thing and clash 1-on-1. At some point during the fight they revert to their human form and continue to clash (violently for kuuga, by talking in Zero-one). But in the end the protag doesn't succumb to darkness.
The only twist is Horobi doesn't stay really evil in the end contrary to Daguva.