The thing with Casimero is not he is not backing down to any challenge. Although right now he seems to be on the way to maybe a crack on a belt in any organization at the super bantamweight, any of those current champions right now. But we love to see him and Inoue getting into the ring, at least for the belt so that we can see how good Inoue is.
He doesn't know how to back down but all he needs is an opportunity to fight for the championship. However, since boxing is a business, it won't be easy for him to achieve that. Inoue is focused on winning the championship in this fight, so it might be tough for Casimero. Inoue may not agree to arrange a fight with him, especially if the rumors are true that he is avoiding Casimero, who has the potential to jeopardize his career.