You could be right, but if I were a GM looking at his stats from last year to this year, I'd take into consideration the difference in talent from last year of his Baylor team. Miller wasn't on the team last year. This years team is better then last years team. On a better team a players numbers are bound to drop. I haven't seen his #'s from last year, but as you said if they are similar to this year one might say he his better. I'm not arguing with you just giving another perspective on his upside.
Coming out one year later, and if a gm feels like this, then he is one year closer to reaching his potential. As I said before you could be right, most of this is guess work on my part, and just my opinion. That's why I can see him going very high in the draft. Just curious has Jones said which position he'd rather play in the NBA? If he wants to play sf, and proves it in workouts, that would raise his stock I'm guessing. That's something else to consider.