User blog comment:B214/Volume 23 discussion blog/@comment-1884090-20170411154430/@comment-10330822-20170411184644

There are some theories that Kiba's sacred gears will fuse soon. As of right now, Kiba's inability to access both Balance Breakers is a disadvantage to him, so the fusion would solve that.

However, I don't think I've every heard anyone suggest the demon swords fuse with him. Seeing as what happened to Sig, I'm not sure we "want" that to happen.

Him overpowering the swords rather than fusing with them I feel is a much better idea, because it would show Kiba's dominance over the swords, rather than a synthesis with them.