The very fact that, ten years after it was assumed dead and scrapped, the show went on.
While Tsukiyomi is in the middle declaring his victory by having unsealed the Jet Matrix, his Evil Gloating is cut short by Suou and co crashing a ship into it.
The final battle. When the stress of piloting Giga Road is too much for Ame, right at the crucial moment, it accepts Suou as its pilot without missing a beat. He ends up delivering the final blow that destroys the primary source of the Shinobi's reproduction.