Benitez a class level above the slightly underrated Mamby, he wins a UD in a very technical bout. Some might call it boring.
Personally, I think Saoul may have enough experience and tricks to pull off the upset in a close fight.
Different level of fighter. Mamby was nothing special. The longevity thing is cool, but I've never found him impressive in the footage.
Mamby's tricky defense, consistent jab and accurate right might be enough to win him a few rounds, but the kid who schooled Cervantes probably impresses the judges a bit more throughout the fight with his fast hands and flashier defense. El Radar, UD by a 9-6 or 10-5 margin.
Bruce Curry was nothing special, while I agree with your general sentiment and agree that Benitez would win here, one thing Mamby does have is the superior jab.