User blog comment:B214/Question and Answers 6/@comment-2607:FB90:2B65:F6D:849D:C9C8:262F:BFD2-20200129195814/@comment-10330822-20200131042217

That is in part what I am implying. Kiba's biggest weakness is that he can't use both of his Balance Breakers at the same time, but his physical strength alone isn't that relevant.

Kiba's Sacred Gears are essentially just a holy and devil sword equivalent of the same Sacred Gear. And since Kiba already as an ability to fuse the two elements, it begs to question why the gears themselves cannot fuse. Making the Holy Demonic Swords in perhaps in standard release and the Glory Drag Troopers as the Balance Breaker.

Kiba's Balance Breakers are much better than most would give credit to. The Holy Demonic Swords are especially broken because they can absorb aura to empower an opposite aura to the sword. Which is much better than just empowering an identical aura, as the opposing aura will in turn make the sword more dangerous at the same time making the opponent weaker because their aura is being depleted. That is it isn't so important that Kiba be stronger than the person he fights, as he can systematically weaken them and strength himself at the same time.

And as DevilSlayer pointed out below me, the holy element would be more useful against a devil like Issei than the demonic element would. So, logically, using Blade Blacksmith against Issei was smart on the surface. He can use the holy swords to weaken Gram's damaging aura, while at the same time strengthen its effectiveness against the devil Issei. Plus, his new jet boots increase his speed to help him overcome Issei's vastely superior power.

Problem is that the speed wasn't enough. Even with the enhancements Kiba was still not that effective in dealing real damage to Issei. In order to do a better job Kiba should have used a Holy Demonic Sword.

But there in lies the problem. If he uses a Holy Demonic Sword he can't use his jet boots, if he uses the jet boots he can't use Holy Demonic Sword. Without the jet boots he can't last against Kiba, Kiba has already said that his training with Ise is always intense because Ise has such an overwhelming power gap that one-hit could be the difference between life and death.

So you see, the fact he can't activate both screws him over. If they were fused, it would solve that problem and make him much more dangerous. He could use Holy Demonic Swords to absorb Ise's demonic power and increase its holy element. Or, he could have his Drag Troopers use Holy Demonic Swords en mass, and use them to drain Ise's demonic power while at the same time using the jet boots and Gram to inflict the damage. Or, he could do both. Kiba is really no joke, and in fact, I fully expect him to probably master Gram and the other demon swords, and maybe even use the armor extensions of Drag Trooper to give himself multiple hands so he could wield all of them like Sigfried did.