My reasoning might be speculative but it might help anyone who is looking to bet on this game. Some of you might question why Naoya Inoue challenged Stephen Fulton. The reason is simple, he is exceptionally talented, and with his accuracy to punch hard, he is worthy to challenge Stephen Fulton. Stephen Fulton has an impressive boxing record, he has shown the world his impressive defensive skills, and impressive footwork but lacks attacking abilities as per my understanding. Overall this would be an interesting match to watch and my research says that Naoya Inoue is a little better than Stephen Fulton. If betting is my primary objective, then I would bet on Naoya Inoue.
It's not a question why Inoue challenged Fulton, definitely he has the talent, it's the question on whether he can do it a a new weight class wherein he doesn't have the experience and we don't know if he can bring his power to this level.
Stephen Fulton has face a lot of great boxers as 122 lbs, for sure this could be his toughest test to date. But he is also confident that he can beat and take that 0 from Inoue. And another factor is that Fulton is a slick black fighter and it seems that Inoue hasn't fought this kind of boxer. All the boxer he fought wants to go toe to toe and not using movement at all.
Inoue is quick; he is capable of catching Fulton and possibly knocking him out. With Fulton's low KO rate, Inoue can be more aggressive and pursue him. It's true that Inoue has not fought a boxer like Fulton before, but at the same time, Fulton has not faced a fighter like Inoue either. So if there's a challenge here, I believe it will be for Fulton.