It's not that far from the last weight division where Casimero became a champ, he can still move the same and his fighting skills especially his speed is still applicable though the opponents strength might be tougher from this new weight but proper adjustments and enough trainings and sparring may let Casimero to stand out and bring the win.
I'm expecting Casimero to be like that. No offense to Akaho but this should be an easy fight for Casimero.
If we can expect a 100% healthy Casimero like the way he performed as a WBO Bantamweight Champion, I'm seeing no reason how Akaho can keep up against him. However, if there will be an upset here
(and I'm not ruling out that),, and let's say Akaho got the win, Casimero needs to deeply think about what the problem is.