He can match with other boxers that he haven't taken yet and I guess that's where he should focused first before aiming for someone like Inoue again.
A rematch with Inoue is not even close to happening. The time Nonito Donaire will take a shot again at the Bantamweight title, Inoue might be at the point now where he challenges boxers in a much upper-weight division (probably at 122 lbs up) which is possibly his next task if he will become an undisputed champion on the bantamweight.
That is a huge possibility, despite that possibility, I am still wondering if the Inoue and Casimero fight happened, who would have won? Is there a chance for Casimero to win that fight? I heard from some Youtube blogger that Donaire is evading Casimero because the latter has a huge possibility to beat Donaire.
Well, maybe that blogger was right that Casimero has a high chance to defeat Donaire than the other way around, I mean we saw Donaire's recent performance and we can really say that he ain't that much of the Filipino Flash anymore that we used to know. And I think going down in Super Flyweight division will be a good start for Donaire before he retires soon.
I think Donaire can still beat any at bantamweight, not name Inoue. Naoya is too much for this weight division, he is really above and elite on this level. As far as Casimero vs Donaire, it will still be a toss-up, 50/50 in my opinion. Casimero most of the time is reckless and we all see how Donaire counter is, if he perfectly caught Casimero coming in, then I wouldn't be surprised to see him getting knock out by Donaire. However, this is a foregone conclusion for now, Donaire wants to go down in weight, while we don't know what will be Casimero plan in his career.
Yes, Donaire can still defeat any boxer in the bantamweight division but he will still end up facing Inoue because the latter has 3 belts in the said division and he might be an undisputed boxer this year if he will get a fight against Paul Butler. So, Donaire needed to go down in weight if he wanted to be a champion again and defeat boxers along the way.
And about Casimero, I really don't know what is his plan because he's been silent for some months now but maybe he will pursue his career in the upper weight class and might bump into Inoue if the latter will also climb the same division to collect some belts too.