Can't hit, can't pitch, and can't field is no way to go through life, son. http://i0.wp.com/www.themovies.co.za/wp-content/uploads/2012/06/Animalhouse1257.jpg
B-r.com shows the age difference as just under one year. Hu is not quite 21 and a half. A year matters a good deal when forecasting (and my ranking of ceilings several weeks ago did indeed put Stewart higher than everyone), but Hu's hardly so old at high-A as to need to be qualified as "still a prospect".
The Garza thing was irritating because we traded away the wrong guy. You'll recall we had a perceived glut of good young starters. There were differences of opinion about who were the best among the group; hindsight now is 20/20 of course. But Garza was the one that seemed clearest to me not to trade. I think the Twins went with whoever got the most in trade, whereas I'd be inclined to trade away whoever got me the least, unless I was very sure my scouts were miles better than the Rays'. I think the Twins were also overly swayed by not liking Garza's cockiness or whatever.
Blyleven observed that the Twins needed a starter to go deep into a game, and that that's what Milone has done. Blyleven observed this after Milone had 5.1 innings to his credit.