Unlikely? F1Zaurus and GoldScorpion are normal Best Matches - they would be weaker than EVERYTHING in the plot by that point.

I don't know why but I'm seeing Faiz somewhere for some reason...and ITS BUGGING ME!!

True, although besides CrocodiCon, they are the only best matches left in the belt without a current toy listing. Which doesn't leave much room for a movie-exclusive item, which besides Fourze, have almost always used a sound in the belt (when the pin system is used). While it's possible that some new item is made that has sounds, I'd say that they'll probably use sounds already in the belt for the movie.

To be fair Darwin and Napoleon got used in the Ghost's movie and they're weaker than the forms available at time such as Grateful and Mugen. We're also still getting new best matches in the show despite the upgrades and according to this catalog we're getting two more.

Well Bat and Engine are supposed to be normal Best Matches too

*Sees Genius Form*
YEEEEEEEEAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHH. TAKE MY MONEY!!!!!!!!!!!

I think Build will be has extra Final Form when he combine Genius Full Bottle with Hazard Trigger.

Genius Full Bottle + Hazard Trigger = Kamen Rider Build Genius Hazard Form (Dangerous Genius).

Maybe this combination will be used in Final Episode.

No. The Genius Fullbottle is like the Cross Dragon - it says it's own sounds. They'd clash and be said at the same time. It's impossible.

Who's the real villain in Build? Rogue? Or that new KR Evol?

And what would be his identity?

It has occurred to me that maybe the Evol Bottles are the "FullFull Bottles" that got talked about earlier and maybe that's how RabbitRabbit and TankTank forms are created. It looks somewhat simliar to what was leaked earlier.

So that would leave the upgrade chain being -

Build: RabbitTank (+ all alternate forms) -> RabbitTankSparkling -> Black Hazard -> RabbitRabbit/TankTank -> Genius

Cross-Z: Cross-Z -> Cross-Z Charge -> DragonDragon -> Magma

Grease: None by the looks of it though he may get one upgrade...

Rogue: Night Rogue -> Kamen Rider Rogue -> Mad Rogue

Stalk: Blood Stalk -> Kamen Rider Evol?

At any rate it's interesting just how many riders and merch there is going to be considering how little there was at the start. This toyline is going to be absolutely massive...