I saw the Ken B.-Estaban D. thread and thought of this one. PvP middles. Who prevails? Tho I can see both sides, perhaps Nino's great attack/counterpunch skill might prevail here in a UD. Other results possible. I'll weigh in later after some (more knowledgable minds than mine) comment...
certainly not the most knowledgeable on here but ninos movement would cause hearns some discomfort at times but he lacked the power to keep hearns off him and would find a rare occasion when he would be consistently outjabbed. past the fifth, i see nino in full retreat mode. his jab abadoned, his power ineffective, being chased down by hearns. Hearns KO 9
Nino looked good against a smaller Griffith but was muscled around by Monzon. Hearns would be too big and TKO Nino in 10.
For Nino this would be like going against a faster, albeit less durable, version of Monzon. Most likely Hearns by KO. Nino might have a chance if the fight went into the late rounds though.