Rory Lobb moves like real forward, very agile, closer to the King bros. Ryan does not move anything like that.
More to the point to be an AFL key forward you need to be able to hit the ball at pace with your arms stretched out all the while with someone up your hammer. Thats after you've already made 3 or 4 leads, been bumped a few times and may or may not get a kick where you want it.