Was Roy Jones capable of knocking out Hopkins and Toney in his prime?

Roy won both these fights by way of a convincing decision, but could a more "motivated" Roy knock out either Hopkins or Toney (I'm talking about the first Hopkins fight of course). If he was as fired up as he was in the Montell Griffin rematch would he of had the capability to actually knock these guys out. If the "Killer Roy" were to fight Toney and Hopkins would the outcome of been any different. James Toney of course had a head of cement so he might literally be un-knockoutable... But perhaps Hopkins? Did we see Roy give it his all in both those fights or did he decide at some point in those fights that he was content to just slide to a convincing decision, knowing he was way up on the cards?