Their approach has worked so well the last 5 years, they should keep doing that /sarcasm.
He's 18.5, in HS, and dominated younger teenagers in an area with low talent, of course there is risk here. That doesn't mean he was a bad pick, I have no issue with the pick. But to pretend there is no risk here is odd to me.
I don't think it is aggressive for him to be in low A next year, he'll be older than Sano, and he's the 2nd pick in the draft with "can't miss tools". If he's not ready as a 19.5 year old for low A, then that would be a red flag to me that he's not really a superstar in the making. Superstars are on much shorter paths than regular players, that's part of what makes them superstars.
As for Hicks, I'm not sure why we think he's going to be a solid regular? He cannot hit AA ball pitching. That could change, but I'm down to about 50% convinced now that he'll be a solid regular on a winning team (lots of guys can be regulars on bad teams....look a the last two years in MN). It shows, again, why sometimes trading propsects for proven players might be a good idea.....
All that said, I have no issue with the Buxton pick. It wouldn't have been my pick, but we'll see how it turns out.