I'd put him behind Pineda, Paxton, Hensley, and Robles, though the order of those is likely to change at any given moment. I would put him behind Stanek too assuming he signs. I'm intrigued by the physical talents that Walker has to offer, but after seeing various transitions and attempts to convert various athletes to the mound, I've come around to the conclusion that stuff is certainly intriguing, but on the whole I'd prefer the pitcher who has been around the game for a while, because he has a better intuitive grasp of how the game is going to go whereas when you put the athlete out there, you're probably going to get some blunt instrument who can knock the opposing team into submission when he's on his game and is likely to splinter as soon as he doesn't have his good stuff. But we'll see what they can teach him.