Buchanan, yeah Locche was slick but his offence and workrate weren't very good. I'd take Ken based on out-jabbing Locche.
I'm tempted to straight out pick Buchanan here because Locche had virtually no offensive capability at all. Add to that Ken was, if not a really big 1 shot puncher, a spiteful hitter. Thing is, Locche is one of the very few Fighters to take a decision off a peak Antonio Cervantes so that makes things a lot less clean cut. I'm still going to go with Buchanan as I think he has the smarts to feint Locche and move away then counter as Nicolino is caught static and leaving gaps. Might not be the most exciting fight we ever saw though.
Buchanan by UD. Locche was amazing defensively but not being able hurt or hold off Buchanan is bad for him.
Two favorites of mine. I suspect that Ken's greater offensive output and marginal success with it would earn him the decision. Nobody gets hurt though...