I think it's better for Inoue to really go after Casimero because they already have a scheduled fight already, delaying it might give the impression that he is ducking John Riel for good.
I believe Inoue is not ducking Casimero, but I will give him until next year, if he still would not fight Casimero despite calling him all the time, then I might convince myself to believe that he is really ducking Casimero.
Casimero is at his prime now but he is older than Inoue, so he might just wait until Casimero get's older and take the fight, who knows.
But anyway, both are doing a great job as they destroy their respective opponents,but big fight should be given to the fans who are longing for this.
Yes, he is not dodging Casimero, LOL, they've supposedly fight in April this year, but we all know that the pandemic really affected everyone. And since Inoue is already stateside, his managers or advisers has likely tell him to fight the winner first of Donaire vs Oubaali, makes sense as Donaire is known to American public.
Remember that this is first fight in the US soil, he already made a name by knocking out Moloney, be he needs more established name like Oubaali or Donaire to set a foothold in America. Besides Casimero although the champion doesn't have the exposure to US yet. So business wise, it's a good decision and then chase Casimero. If Casimero opted to fight new opponents so be it. But I'm sure down the line, they will have to face each other.