This I think is a delusional myth. I fully expect MS has some of the best web devs out there. But even if MS has 100 of the top 500 web devs, there are still 400 web devs thta don't work at MS. And there are a million+ web devs after that. While you might argue that more innovation per capita, comes from the top web devs, it's still likely that the next innovation will come from someone you've never heard of.

This is why most people in the tech field at the top of the game aren't afraid of their past-rivals, but more afraid of the guy in the garage they've never heard of. Odds are more likely that this is where the big innovation is going to come from.