As for Fig vs Moreno 4, I don't mind it tbh. I've enjoyed all their match ups and looking forward for another one. This one is close to a coin flip but I think Fig wins it as the event is in Brazil.. That's if he has a good weight cut. The guy is huge for 125. So wait for weigh ins.
There is nobody else who can challenge this two guys in flyweight division.
Only way this could happen if Aljamain Sterling, Petr Yan would step down in lower division, do brutal weight cut to fight them, but I don't see this happening soon.
They could always sign new unknown poor slave fighters that could earn Dana White money for cocaine
