Reactionary much? I mean we are talking about a 22 year old who already has MLB gold glove level defensive ability. He can reach the majors on that alone, especially if he can string together a decent OBP against big league pitching. He's getting it done in the high minors at a very young age, so this *is* a possibility. Very high caliber speed on the basepaths too, especially once he gets it refined. Could easily be a 30-40 SB guy just based on what we've seen out of him in the minors already.
For reference, his SB rates are about the same as Jacoby Ellsbury's were at the same level and age. Actually strike that, he's been progressing through the system one year younger than Ellsbury, but still, close enough. IF he can learn to shoot the gaps you're looking at a very good ballplayer here.
Personally I see him cameo'ing here over the next couple years, then being traded to some team that needs a franchise caliber defensive CF and leadoff man (which is, like, almost every team) but I guess YMMV.