I'd lean towards Medina by close decision based purely on the size difference. McCullough was too wee for 126
Not well! :: In fact didn't Marquez stop him in 7 or 8? Although Medina mighta been a few years past ripening by then. My memory aint the best.... but I'd expect any of the big three woulda beat him, though he might have taken Barrera, more cautious at 126 as he was, the distance.