Let's use an example. There's a kid who knows who to sing, but he hasn't been given a single chance. The talent is there, but nobody in the world knows who the hell the kid is. One day, the biggest promoter in the business signs him and gives him the chance, still, he fails. Still, the promoter has faith on the guy and gives him another chance, with a whole new look, a new persona so to speak. And boom, he becames a succes. The talent for being big and famous was always there, but if it wasn't for the promoter that made him famous, he just would have been another nobody that happened to sing well.
That's the same with The Rock and WWE. Sure, Dwayne might have been talented enough to be an actor, but if it weren't for the WWE, hell, for wrestling itself, he would just have been another guy that happened to probably act well. And let's go further, if it weren't for Vince and booking that made him a main eventer and a huge star, he would still be wrestling in midcard, not mattering if he has mic skills and wrestling skills, if Vince just didn't want it, he would be a jobber