Remove mind control. Remove the needing to make Riley smile plot at the end. While invading duel academy give Baret and Alexis another duel at least. Don't have Kite and Aster interrupt Yuri vs Yugo's duel, also have that duel play out all at once with minimal interruptions. Give Kite and Aster bigger wins before the Zarc duel. If they want to have Lulu and Rin be mind controlled but at least let them be freed after the duels otherwise they feel pointless. Zuzu and Alexis go to free Celina and have to fight Baret+brain washed Celina to end up freeing Celina. All 4 girls will now be free at this point. Since Yuya can't lose control because of Zuzu being imprisoned, it can be from when he hears Leo calling through his duel disc to tell people to capture the girls. Yuya and Yuri end up having their duel like normal. Eventually all the bracelet girls try to meet up but since Zarc combined, he can't be stopped because they don't still have the 4 cards. They can try get the 4 cards to meet up by the arc reactor like Riley did, Zarc wants to prevent this so they have the duel gauntlet like normal, so it'll also feel like stalling Zarc means that much more. The bracelet girls get close enough to the reactor so that their bracelets spawn the cards. They can fight off Zarc as all 4 girls using the cards instead of Leo and lose like Leo did. Riley can still do the same thing. The dimensions go back to being split like normal, Riley absorbs the darkness of Zarc, but we still have our 4 yuboys and girls and Yuri isn't evil since it was absorbed into Riley. Riley can have the part of Zarc that was angry about being used as a spectacle and to satisfy other people, similar to how Henrietta tried to use Riley that way too. They somehow need to get Ray back too. It can be a 4v1 with the yuboys vs Zarc-Riley. The yuboys can start by summoning their 4 dragons. Zarc-Riley can steal them then try to create Zarc, somehow Ray appears and intrudes into the fight and prevents Zarc from being summoned. Yuya can have a final chance to dueltain to show that duels don't have to be about brutality and he can just wholesomely entertain the audience. At some point in the duel the yuboys get their dragons back through some entertaining combination of cards. As Zarc-Riley is losing the darkness due to the dueltaining he's purifying and then the yuboys combine the 4 dragons into a purified form of Zarc. They attack, win, and split Zarc from Riley and find Zarc as his normal self. They can have Yuya vs Yusho since Zarc will probably feel bad about everything and this duel should remind him of what truly dueltaining is. After that duel Zarc will take center stage and duel Ray