Naoya Inoue doesn't seem like the kind of guy that avoids difficult fights. Fulton is a slick American fighter with an undefeated record. In many people's eyes Fulton is the more difficult challenge when compared to Casimero. There was already an agreement for them to fight years ago but the pandemic derailed those plans. There is a long line of fighters waiting for an opportunity to face Inoue, since he is the biggest draw in these smaller weights. Casimero has to prove that he is better than the rest in order to be at the front of the line but the weight issues and promotional problems have set him back in his career.
Yeah, if Inoue is scared of big fight, he wouldn't accept his fight against Fulton in this new division for him. Casemiro need to become a champion, then it's 100% we will see he will fight with Inoue. If he's only an average boxer, it just depends on Inoue's promoter to accept the fight or not.
However it's already 19 days to go before this fight will happen, there's no odds change, so people are still definitely think Inoue will beat Fulton.
Casimero's path to becoming a champion won't be easy since he has yet to have a championship fight. Currently, all eyes are focused on the upcoming Fulton vs. Inoue fight. By the time Casimero becomes a champion, Inoue might have already unified a belt and could potentially decide to move up in weight class once again.