Let us not make it a big deal, that's only a rumor without evidence. Casimero is depending on his belt, so there's no reason Butler would be looking for another opponent because if he wins here, he will become the champion, and not only that, he can also fight the winner of the Inoue vs Donaire rematch.
Indeed, it's Butler that will benefit the most from this fight, especially if he wins the fight.
Casimero is the defending champ and his name already has a good value from this division, if Butler will beat him the chance
of having more great fights will be open for butler.
More fights mean more money on the table, not sure if that rumors have the basis, if Butler is looking for another opponent
it will serve as ordinary since Casimero holds the belt.