Pretty ambitious to pick Spence to stop Benitez when Hearns couldn't do it, and Leonard needed 15 to do it. Spence would have to KO Crawford before I entertain his chances against Benitez.
Benitez was over rated defensively. mostly stink, its not like he integrated his offense and defense effectively like subtle scientists Navarette. or margarito.
Spence Wouldn't Stop Benitez in a 12-Rounder, but 15 Rounds is a Possibility... If Benitez Cuts Corners in Camp, Which he was RENOWN For Just as Much as his "Radar" Like Defense, Spence Would Set a Pace That Could Catch Up w/Benitez After 13-14 Rounds... REED Ain't PREDICTING It, but it Certainly Couldn't Be Ruled Out Either... REED
As Cdogg said, the whole idea of MM's is to assume both are at their bests. Spence gets outclassed by A-game Benitez.