[Matrixbeast]

Quote:

Originally Posted by KRX

And do you not think his friends would try to find a way to get Kazuma out? Besides, given the latest season, if you need a reason as to how Kazuma got out, you could always say, "A Wizard did it." You have three wizards to choose from.

He abandoned humanity to not risk starting the Battle Fight again. His friends don't know where he is.

Quote:

Originally Posted by Blade Raider

Decade is about dimension hooping. No one ever said that was the real Blade, just a version of Blade that Decade did not meet before. I mean, Black and Black RX weren't the real character, but were played by the same actor. Who's to say Decade ever actually met any of the real Riders other than Den-O and W. That doesn't change anything that happened in Blade nor does it make Blade unable to be in continuity with say OOO.

At the end of Decade (Around episode 30 or so), Kenzaki appears with the 8 other Heisei Riders (I think Den-O was missing) and straight up says they're the original Riders, who then proceed to attack Decade for sparing the AU Riders (Since their survival means the worlds would start to destroy each other).
This scene is important because Kenzaki Kazuma is the ONLY one of the original Heisei characters to appear untransformed, showing he's completely human.

That completely changes what occurs in Blade, since he's incapable of becoming human anymore.
And the characters in OOO (Or any other series, for that matter) show no signs of remembering when a swarm of demon roach monsters showed up to casually wipe out humanity.