Might just be because they wanted the new body style sport. These people that drive new Range Rovers can get in and out of them for almost no reason at all. I had a 2015 sport last month that needed a door latch cause it wouldn't latch closed. We would have had the door latch the next morning at about 10AM. Guy said no fuck that I can't wait for that and traded it on the spot for a 2016. It was a warranty repair, wasn't going to cost him a thing, just wasn't going to wait and drive our free loaner for a day.
I like the 13 sports but not as much as I like the new one.