If Fulton will win and Inoue will stay on this current division, the chance of seeing Casimero vs Inoue might take place,
it's possible since the belt will be vacant once Fulton move up.
If inoue losses against Fulton is ranking will surely goes down, while Casimero's rank goes up, it is an obvious feat that they will meet halfway but the problem lies on the promoter and manager. No matter how close they are in ranking if the promoter is against' the deal of the fight, then we cannot see them fighting.
Though if ever Inoue will win, then the chance to see Tapales to be his next target is possible by knowing Inoue, he wanted
to unify all belts.
I read somewhere that Tapales wanted Inoue to win because Inoue's style suits Tapales' boxing style. They said that Tapales will be having a hard time facing Fulton since Fulton does not brawl and often times box his way through the fight.