If you pot shot and land twelve punches or if you throw a combination and land twelve punches its still twelve punches. I think its equally hard if not harder to potshot an opponent is also quick because they eventually learn your cues and its easier for them to block one shot than ten. I think Mayweather could do combinations if he chose to, but as a light puncher it would stupid for him to do so. Roy JOnes Jr. at light heavy weight also learned it was more effective to go one shot at a time. GUys like Leonard could throw combinations, but he could also get outboxed by Hearns because he wasn't able to fight the one punch game, and had to resort to less skill oriented fighting to beat Tommy. I just find the combinations that Roy, Leonard, Robinson, and Meldrick Taylor threw would win points, sometimes be effective, but mostly would be meaningless punches that came so quickly and in such large numbers the opponent couldn't retaliate, but still the majority of the punches would miss. No economic fighter punches in combinations because it isn't economic in nature to do so.