^^ For sure, Casimero is going after Inoue but he has to wait, and all he can do right now is call him through his social media accounts and it's obvious that it's just for publicity stunt as he knows that his time is running out.
Inoue is scheduled to fight Nery and then another boxer that Tapales has beaten already. And only after that Casimero might get his chance, but still up to Inoue as Casimero's name is somewhat in the middle as far as super bantamweight goes as he is no longer a champion, so he has no leverage but to create a hype and call Inoue in his social media for publicity.
casimero is not a big boxer and not a top boxer. and only from the philippines not the USA. so it will be difficult to fight inoue. not because of his boxing quality but promoters need big names so that their boxing events can generate large profits and a lot. if inoue is of course whoever the opponent is offered by the promoter must be served. if the promoter doesn't want it, it's hard for a fight to happen.
He used to be the WBO bantamweight champion of the world, so he at some point in his career a top boxer and and elite one. The problem started with Inoue when he can't make the weight of 118 lbs and so he was stripped of the belt. He has been campaigning around the world not just in the US so he is well known. He is supposed to defend that belt in UK before he was stripped.
So I disagree with how you say that Casimero is not a big boxer or not well-known. Him and Inoue should have fought in 118 lbs if not for the weight issues. And so since both of them are in the superbantamweight of 122 lbs now, there is a potential that can can face each other finally.
And for a gambler perspective Casimero is a good fighter to challenge Inoue, though it will going to depend from how the promoters will push that possibility to engage into a negotiation against Inoue, but as of this moment there are more fighters who are also willing to challenge Inoue, fighters who also taking their time to have that chance.
It's on Inoue's camp to work out to whoever side they will choose for the next fight for Inoue, we just need to wait for any update and announcement from his camp.