When Ali started, he was considered to be very gifted physically, but very amateurish in his style. All the wasted motion, the way he pulled back from punches, the way he slapped and poked with his punches. But he was a HW and the crop of guys in his weight class was weak so he did well. He learned, though, and when his physical gifts eroded his ring smarts and will to win served him well (unlike RJJ, who never learned), which kind of makes you wonder if all that 'greatest era' of HWs stuff is just nonsense, but I digress.
Archie Moore is a curious case. You know there is no way he came out of the box the crafty guy we saw against Marciano and fighting on after that, but he obviously had some predisposition to being boxing smart. That and look at the guys he fought- if you had the physicality to fight with them you could learn an awful lot.
What did Morrison have? He beat up a bunch of stiffs and lames and set-ups. Foreman was ancient and Ruddock sucked once he quit using his jab. Here's the thing about the left hook...A guy can have tremendous success with that punch if he knows how to counter with it and how to set up those situations. But if you walk around with all your weight on your front foot, always dipping that way like Ruddock did for years (or Trinidad in the Hopkins fight), or coming in with all your weight up front (like Frazier) you'll have limited success. And you will pay dearly for the success you do have because you are there to be hit.
In that sense, Marciano/Goldman were smarter than Yank Durham/Frazier, though both sides had to play to the strengths of the respective fighters.