Casimero is a WBO Global super bantamweight title holder now, I think he can force a mandatory fight with Inoue when Inoue successfully defeats Fulton. I'm not so sure about this but its possible. If no one else is just willing to fight Inoue why not Casimero.
It is possible but I think the no.1 contender has more chance for the mandatory title defense unless the boxing council will give authority for the champion to pick his opponent.
As far as I know in their bantamweight day, they had an unfulfilled schedule fight. It was canceled due to pandemic and was never been rescheduled again. I also don't think that Inoue looks at Casimer as nobody because Casimero had proven himself by holding the WBO belt before it was stripped from him. The belt was stripped not won by Butler against him. It (belt strip) maybe cost by carelessness of Casimero but we cannot deny the fact that Casimero was a WBO bantamweight champion while Inoue is holding the other belt.
We all know that Inoue is a very gentleman boxer , he doesn't mess with anyone and he doesn't look for any type of problem either , I think that maybe for that reason they Respect him, as far as I'm concerned I see Inoue as a genius boxer, where he knows how to use every detail of his technique to apply it to a particular boxer knowing that his study is quite strong , then this is reflected in his victories, now, if Casimero considers that he thinks of him that way , well , I think not He has been very good at it , if he must have a Little desire to fight with him , but due to his track record he knows that he cannot be Trusted.
There really has to be done for fights to happen because its just not fun anymore to see top boxers ducks each other. They better make things happen or its the fans losing their respect to the boxers they look up.
Ryan Garcia and Tank Davis set an example already for them already. So if Casimero comes looking for fight pointing Inoue, a yes or no answer at least will shed the light and giving the organisations to decide.