Looking at this guy's record doesn't sound any different than the other fighters who have been knockout by Inoue. Looks like Inoue has a high chance to be the undisputed champion at their current weight. It's fine to be the best of all before your will gonna step up to the higher class where powerful boxers await you. Of course, it will be different because you might be surprised by their speed and power too. But if Inoue maintains his style in the upper-weight class, I'm sure he will gonna dominate it as well.
Paul Butler will surely struggle soon if this fight against Inoue for the undisputed boxer will materialize, even Donaire had a hard time following the latter's punches and only knew the punch when it landed upon him, what more if it's Paul Butler. The way we saw Inoue's power is already enough to say that he will be the undisputed champion in this division easily.
Until then, I think Inoue will chase another belt in another division if he will claim to be the undisputed champion in the bantamweight division.