In any case, if they are not willing then we have to wait for the Casimero vs Inoue then. Hope that Casimero will win against his mandatory, I'm sure majority of us are not familiar with Butler. Not saying he is not good, of course we are going to favor Casimero in this fight.
I think that will not end up in that way. Inoue will not oppose that because why in the first place. Casimero vs Inoue is a big deal but not to the point it will still push despite WBO ordering a mandatory fight. Fans can just wait to settle this. It's not even a problem for Casimero as he will just accept fights especially that it's mandatory.
If Casimero really eyes to fight Inoue, he should defeat all the boxers that will be assigned to fight him. There's a big reason why the fight with Inoue is not able to arrange this time and that's something we should not need to know.