I've kind of held this in for a while, but what exactly makes you think he will be a 20+/40+ player? I've seen the scouting reports, but I just don't buy it. I think right now his base running is pretty awful, and even for a mediocre team like the Pirates, they are not going to let him run 70 times a year so he can steal 40 bags. Also, I think 20 HR are at least a few years away. These are just my thoughts, but he is so highly touted, and I just don't see the production to back it up.
Before I hear this argument, I know he is very young for AAA, but that means he will be even younger for the majors. I am not saying he won't be good, but I think asking for any more than 10 HR/20 SB in 2009 is lunacy.