There's no health issue happened and the cancellation of the fight is due to Casimero didn't catch the required weight to make the fight happen so I guess Casimero failed to do his part to make this fight happen that's why maybe its almost impossible for this to be done by them. But if their management will try to fix this then provably they could find ways to continue this match up and if Casimero win then this is his great ticket to challenge Inoue.
I think you are outdated. It's about the medical condition of Casimero that's why the fight was canceled. He was no show during the weigh-in. Just for a recap on which I think I posted here, WBO gives 10 days to Casimero to clear things up, or else the title will be stripped. Since Casimero's camp comply, the title will remain to him and the match against Butler will be pushed but no official date yet for the reschedule.
Not sure and please correct me, this mandatory needs to be taken care first before he can fight another boxer, am I right?
As a mandatory fight, yes, that's correct.
Well in the beginning, everyone thought that Casimero doesn't want to fight that's why he is a no show in the weigh-in and there are speculations that he can't make the weight, hence his absence. So everyone writes him off and says that he is going to be stripped of the title.
But later we found out that he has some kind of virus and the WBO gives him a chance to submit a medical certification to clear his name. And thankfully, WBO is fair as they deem that Casimero has a valid reason so he was not strip of the belt and then they are going to push for the fight.
They even have a replacement in Joseph Agbeko which Butler did not approved though.