Walker has to mature as a hitter, IMHO. This might mean that he is a guy who can be pitched to, but who pounds "mistake pitches". If he can turn a bunch of mistakes into long balls, he can be successful at any level. The other piece in the puzzle is to be more selective, without losing too much aggressiveness. It's tough to thread the needle, but some hitters can and do succeed despite high K numbers. Also, it helps that Walker has good speed, and a good arm. He should develop into an above-average outfielder who can steal a few bags in addition to having plus-plus power.