Ask HN: Difference in management styles of Ulrich Drepper and Linus Torvalds

Linus Torvalds stewardship is often cited as critical factor in thriving linux kernel development Ulrich Drepper is often cited for preventing widespread community contribution to glibc and causing forks such as eglibc. For casual observer like me it appears both are technically brilliant individuals who have strong opinions and dont suffer fools lightly. What caused linux to thrive ? Was it the organizational heirarchy of having individual maintainers for different components in the linux kernel ?