I like Kuroda a lot, but he's not a true number one, at least based on how I define it. When I talk about number ones I'm talking about guys like Kershaw, Verlander, Harvey, Lee, etc. There are, at most, 15 of them in the entire league. Kuroda doesn't belong in that category. But you can probably change the definition of a number one to include many others, so this is all just really semantics.
My only point is that the Yankees should have a very strong rotation, albeit without an elite pitcher.