According to asian boxing, Kyoguchi's team are planning on sending a offer to Menayothin for a fight in september in Japan. Hopefully this fight happens.
I'm not wasting any minutes on this until it's made (you know what like), but high level, I'd say that it's more likely that Menayothin enough left than Kyoguchi being a genuine superstar. So I'd go for Menayothin without looking.