You want a batter to be aggressive. See a pitch you can handle and give it a good hard whack. Hits are better than walks. As the hitter goes up the chain, and eventually reaches the majors, those pitches he can handle become fewer and fewer per game. The question is whether he gives in and swings anyway, or takes more pitches. Walks are far far better than outs. The hittable pitches he saw in the AFL don't tell us much on this aspect. I wouldn't have wanted him to take too many of those - unless, early in the count, he wasn't waiting for pitches he could try to drive over the fence or at least into the gap. I wouldn't want him to swing at the all the stuff he'll see in 2015, either - it would be nice for those walk totals to go up. Wait and see, I guess.