I'm not old enough to have seen the Brantley's, et. al.
But I look at talent as well as the intrinsic things you can't teach. Holder is "different", and that's one of the best descriptions I'll ever give of a kid I scout (and I don't do baseball, but I grew up on it and know what to look for mostly). You knew it very early last year, and his consistency and attention to each pitch just puts him up there for me.
Maholm and Stratton were lights out, parties over. So is this guy. HATE talking about a kid that's so young, but he just sticks out, and always has.
I hope he has a great career, and I expect him to do extremely well here and further barring anything happening.