The comparison is stocks as a prospect compared to stocks as a prospect, like I said, stocks is an indicator of more than getting stocks in the NBA. I am dinging him because one of the most important indicators of defense (really players as a whole) is very low. If you can't wrap your head around the concept of an indicator, I can't help you. Dort is evidence for me, he was a better stocks guy coming into the draft. If you want to counter my logic, find a guy who whose stocks were lower than Castle's and that would serve as a counterpoint.
I do think Castle can be an exception to the rule, but given that there have only been two guys in the last 10+ years to receive an all defense stocks with lowers stocks, I hesitate to say he will be the very best in the NBA.