Fight Tapales to win undisputed, then KO Luis Nery as retribution for Shinsuke Yamanaka. Then KO Casimero.
He has to go for Tapales, and try to become a 2-time Undisputed World Champion. I don't even know how many boxers in history have accomplished that. Would put him in the top tier of best boxers ever.
Honestly Nery is a tougher fight than Fulton. Fulton would beat Nery, but I think the style that bothers Inoue are huge punchers since he does leave himself open at times. He could also knock Nery out in 1 tho.
Hard to say because of the evolution of belts. There are 4 recognized ones now, before that 3, before that 2, then back in the day it was the NYSAC or something like that. Crawford would be a 2 division undisputed champ if he wins Sat. Holyfield did it at CW and HW.
The obvious answer is Tapeles. At some point soon I'd love to see him move up again and fight Loma though, at 126 -130 depending on what Loma can make. The skill level would be insane!
I give tapales 3 rounds tops. He can punch batter than fulton but he's way too easy to hit for someone like inoue