[Denanstu]

With Zero One's new form, especially with the dual insert gimmick and the progrise key gimmick that matches what Thouser's overall design gimmick was, it could be something that we see the two working together on.

As for whether or not it is the new form, I think it comes down to whether or not Isu becomes a sort of on-board AI for the fighting or if she directly links to him during the process. In the series that has an intregal side character to the plot such as W and Drive, has the characters joining up as 1 rider. If that happens, then this will be the final form. There is some minor evidence to suggest this, as the unfolded section mimics the Satellite Zea a bit, which has been another key component to the series. If it isn't, then I expect this to be 1 component of the final form.

From a toy perspective, it feels a bit of a waste to have 1 dual product needed to do your grand finale. To compare it with something, look at Ex-Aid, Gaim, and Build's final form. All of them had some extra slot/gimmick that became core to their later upgrades/forms.

Looking at the timing of the show, it doesn't give them much time, as this upgrade will probably have to be introduced by episode 38 if it is not the final form. That way, they will roughly have 6 to 8 episodes to try and show off the form before moving onto the final form, which would have the inserted piece and a newer progrise key that comes from Isu besides her personal progrise key.