I might be wrong but do you mean, Inoue vs Donaire is not a good fight for you as you want Casimero?
Better playback what happens in their first meetup that it needs a rematch. Maybe you just don't know much Donaire that's why you want Casimero for him. Casimero is even overrated. The way he is struggling to maintain his weight, how can he even match with a much more fit Naoya Inoue.
I have to agree that the fight between Donaire and Inoue deserves a rematch. Then, what If Donaire wins the rematch, then a trilogy would be much interesting.
I guess Casimero still have a chance for the Inoue fight later after Donaire.
I want to believe he's overrated, but not until he fights Inoue.
We can't deny that guy is also a good boxer and carrying much hype with his character.
Definitely a rematch between Donaire and Inoue will be asked if indeed Donaire will be the one who will announced as the victorious one in their said rematch, there's no doubt about that as their standing would be 1-1.
But in terms of Casimero, I think he's quite far in the picture now. He have to decide whether he wants to remain in bantamweight or move up and wait if Inoue will also move up. He needs to settle his own fight and problems first.