I thought that the recent episode was pretty good. The duel was fairly engaging and while I'm still not much of a fan of Number 107's design, it looked cool whenever it activated its ability. The roars from the two dragons colliding with each other was also pretty neat. I also wasn't expecting Chaos Number 107, especially this early, but they didn't reveal its design. I'm guessing that they're saving that for whenever Misael and Kaito have their rematch. At least it sets up a potential rivalry and Yuma won't be the one to defeat Misael most likely. As much as I don't care for Kaito, I'd prefer seeing him get more screentime over Yuma, especially when the later is just going to get more anyway.
I think that the sphere broke down because it couldn't contain Chaos Number 107's power. That does make me less annoyed at the fact that they didn't use them earlier if they aren't capable of handling Chaos versions of their over-one-hundred Numbers, although I'm not sure if that's just from Chaos Number 107's power or if all of the other Chaos monsters would destroy the sphere, but it at least it shows that the spheres aren't completely ready yet. The ending with the sphere being destroyed and Shark and Yuma falling down a cliff was pretty intense. I'm not that eager to see a Yuma recover from depression episode. I wouldn't want to see an episode focused on the Numbers Club again either, especially when it will most likely make most of them look like unnecessary characters, but Shark helping Yuma to regain his spirit doesn't sound too interesting either. Although, Shark is at least doing something, so there is that to look forward too for me.