How far away are fantasy baseball's future stars?

Fantasy baseball managers love their rankings because much of the time they simply want to know whether we would choose )and invariably, whether they should choose) one name or the other. It's a rather simple game, really. This fellow or that fellow, and in the case of Vanderbilt right-handers Jack Leiter and Kumar Rocker, very different pitchers who went to very different big-league organizations in the first round of Sunday's amateur draft, there is no obvious answer.