Oh man, I was not really disregarding his hitting there. He is having an impressive season, but he is striking out at an incredible rate in AA. That won't get any better in the majors- it's not hard to see him striking out 40% of the time or more in the pros. Even Adam Dunn can't touch that, and Dunn walked a lot more. It's hard to see a guy with Walker's peripherals succeeding. Maybe he develops better plate discipline, but he is going to have too many at bats where he does nothing positive if he doesn't. He's also a couple of years older than Sano, which is important to factor in when you're comparing the two.