We don't know that for sure and that's another speculation that Donaire has some plans to lure him and eventually take him out of the picture, honestly I can't really think that Donaire would do such thing to his co-Filipino boxer.
It's really unfortunate to Casimero because he did faced many complications towards this supposed fight against Butler but for the 2nd time he still didn't make it and worse he has been stripped of his belt.
It's never on Donaire's reputation to harm his fellow fighter's reputation or boxing career in fact he back out in a planned fight with Casimero because things are getting nasty and personal, this is not how he fights he wants to be in a professional level, he is a role model for Filipino boxer and he wants a continuation of Filipino legacy in the world of boxing.
I guess it's competition, maybe it was not Donaire's plan, but sooner or later, they will have to face each other. Remember that they were supposed to fight, but Donaire back out. So the best thing for Inoue, is try to get back on his feet, be positive and get a good trainer. He fired his long time trainer and his conditioning coach prior to the supposedly Butler fight and this happened to him. So it's easy to fix, in my opinion.