After Apple, Jobs didn't sit on his hands, but went on to found two companies - Pixar and NEXT. Pixar alone would have made him famous, again. And, NEXT assured his return to Apple, because of Apple's failure to innovate in early 90s and the need of something, anything to restart its OS line. NEXT and Jobs were their best bets.
Even without Apple Jobs would have accomplished many things. That's just the kind of person he was. So, luck has nothing to do with this.
