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.
But the fact that Casimero is having difficulty maintaining the required weight, that he needs to undergo a sauna, he won't stand a chance against Naoya Inoue that is fully well balanced, comfortable and disciplined at 117 pounds. It's hard to do what they do in practice if they can't maintain the required weight.
Now let's focus on Donaire and Inoue and don't mention Casimero. He is now totally excluded from this. As per recent reports I stumbled on the net, he now becomes the no. 1 challenger for his former title. He might fight Butler later on but not this year.
Butler also gives a hint that he might challenge next the winner of Inoue vs Donaire.