the main concerns with jackson were his K-rate, ability to hit for power, and likelihood to stay in CF. his K-rate is down as a pro, which is good, though the sample size is small and he's going to face more advanced breaking pitches as he moves up the ladder. he hit for no power in arizona/boise (1 double, 2 triples, 1 homer in 27 games) but has turned things up at peoria (3 doubles, 4 homers). as for staying in CF, i can't really speak to that... but at 6'2" and 210 lbs, he probably can't add much more bulk.