No scouting report that I can remember calls CJ a #1 starter. They pretty much all consider his ceiling to be a #2 with the floor of a high leverage reliever. In MLB's current top 100, there are 24 pitchers ranked ahead of CJ. Of those 24, a handful are projected to have a ceiling of a true #1 starter, someone who has a decent chance of becoming a top 30 starting pitcher in all of baseball. CJ may be a #1 prospect in the sense that he is the Cubs #1 (top-ranked) pitching prospect, but he's not projected to be a #1 starter in the bigs even at the most optimistic projection. Those guys are Giolito, Bundy, Cole, etc. or already established guys like Kershaw, Price, Zimmerman, etc. When I see discussions like this I tend to get the feeling that we're operating on the silly ass notion that there are like 5-10 "true" #1 starters in all of baseball or something.