Sahaprom was a small BW by his time's standards. Jiro was a decent sized SFly in his own era. I don't think there's be a major size discrepancy. Veeraphol had a similar training style to old school boxers and more modern day Muay Thai fighters. He didn't do full on training camps, he just worked as hard as he could all-year round. A bit like Rigo in that regard. He didn't have to work to make weight. Anyway, I take Veeraphol here. I think his attitude vs southpaws is what he needs vs Jiro, as he'd be more than happy to fence it out at range and fire that nasty right down the centre. Watanabe was a lot more 'on-beat' than Hozumi was, and in terms of being an aggressive southpaw, he reminds me a lot of Chuwatana. I think Sahaprom's upper-body movement would be good at setting up the uppercuts too, as Jiro could be vulnerable to them as he dipped at the waist. They're on similar levels IMO, but I think Sahaprom's jab and cross-counter are better suited for Jiro's southpaw-ness IMO.