Ford tests competing vehicles all the time. When I worked a the Dearborn test track in the early 70's, it was not unusual to see vehicles from GM and Chrysler parked in the infield. The fact that somebody photographed a Cadillac next to Mustang means nothing.
It looks like it's possible, but they'd have to continue having months like this to get there!
Nautilus is having one of its best years, I think (I'd have to go dig into some numbers to say for sure) - what I'm not sure of is how much inventory is the outgoing model vs. the new model.