Yes, but he took over iOS on October 29, 2012.
It is quite possible that the most problematic irritations in OSX ultimately rely on control over both OSs to get them fixed, given that they share so much code and that some features are introduced first in one, then in the other.
I could imagine, for example, in the past, that if an OSX person wanted to fix say, some aspect of sandboxing that was causing problems for OSX, he was told not to touch that code because it might cause problems for iOS. Now, with a unified head of both OSs, it's easier to get issues like that resolved IF the guy at the top wants them resolved.
Fair point.