I believe SJ even admits if he was not fired back then he would of killed Apple computers and it would just be a foot note in history at this point.
I don’t think he has ever said anything like that. In fact, if you read some of the interviews he’s done he basically said Apple’s management while he wasn’t there ran the company into the ground.
From
Triumph of the Nerds,
JOBS: Ehm what can I say? I hired the wrong guy.
Q: That was Sculley?
JOBS: Yeah and he destroyed everything I spent ten years working for. Ehm starting with me but that wasn't the saddest part. I would have gladly left Apple if Apple would have turned out like I wanted it to.
http://www.pbs.org/nerds/part3.html
However, he has said that leaving Apple allowed him to experience one of the most creative periods of his life because he bought Pixar, formed NeXT, and got married within those years.
From
Jobs’ Stanford Commencement Speech,
"I didn't see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about everything. It freed me to enter one of the most creative periods in my life. During the next five years I started a company named NeXT, another company named Pixar and fell in love with an amazing woman who would become my wife. Pixar went on to create the world's first computer-animated feature film, "Toy Story," and is now the most successful animation studio in the world.
In a remarkable turn of events, Apple bought NeXT and I returned to Apple and the technology we developed at NeXT is at the heart of Apple's current renaissance, and Lorene and I have a wonderful family together.
I'm pretty sure none of this would have happened if I hadn't been fired from Apple."
http://www.freerepublic.com/focus/chat/1422863/posts
It is rather amazing that the main technology they created and refined at NeXT is at the core of every Apple product today. Also, Apple’s current software chiefs Scott Forstall (iOS) and Bertrand Serlet (Mac OS X) are from NeXT.