We can't really tell if he is uncomfortable in this division or not. We will have to wait and see how he is going to fare in this fight against Akaho.
Nevertheless, if he is not going to struggle in weight then it's a + sign for him in this division. Yes, he will still need to go to a diet but maybe at not as rigorous as when he is at 118 lbs. For me, it's the question on whether he can bring his power or if he is too small in this division to make damage to tall and natural super bantamweight boxer.
And also his speed knowing that he is adding weight it will be affected since he is not really used to body shape, though a fighter needs to adjust and he really needed this break to make his name notice from this division, if he succeed then we will expect more from him showing his talent, Casimero will find a way to make his comeback noticeable, expecting to see a toe-to-toe engagement with Akaho.
It will be an interesting fight if Casimero will bring his entertaining skills. I mean, he loves the attention he must win the crowd here.