They rent space at the tracks just to make sure they have repair facilities close to the action so to say.

No need to cart the craft all over the country just to fix it and then launch it.

Unlikely. More likely the military wants greater flexibility in its orbital options, and launching from Kennedy gives them that.

That’s just an example of poor journalism. No one with any knowledge of the X-37b would call it a spy plane. It ain’t a plane and most of what it does probably has little to do with spying.

I was actually reluctant to link this particular article but it actually had the most details of all the stories I read on the subject, despite being poorly written (as you noticed).