He did what needed to be done. Linux similarly has thousands of contributors and Linus's personal "code contribution" is almost negligible these days. But code doesn't matter. Literally anyone can generate thousands of lines of code that will flip bits all day long. What matters is some combination of the following: a vision, respect from peers earned with technical brilliance, audaciousness, tenacity, energy, dedication etc. This is what makes Linus special. Not his ability to bash on a keyboard all day long.