I can potentially see the Jr. Mw McCallum giving Robi a good fight by working behind his jab and getting in close. But I think the older, smarter, but less powerful Mw McCallum would play into Robi's hands.
I should have specified. I mean at junior middle. Robinson only weighed 155 in the St. Valentines Day Massacre - he had more of a junior middleweight frame anyway.
I suppose the pressure fighter version of McCallum is a good match-up for Robinson, but ultimately, Robinson is much better at almost everything Kalambay used to beat McCallum.