That's because he's not overhyped by the media or fans outside Ottawa. 60pt wingers are fairly common. Heck JVR is on pace for 70+ points, he's having a better offensive season than Stone. Doesn't mean he's a legit 70pt player.
I don't know what the Selke criteria is so I won't comment on that but I'm assuming it's more than just takeaways, hence why it's usually centers who are nominated for the award.