In re turning CJ into a starter -- have you ever looked at how the guy is put together physically? He has almost no muscle on him. He only achieves the speed on his pitches that he does through his extremely long motion-arm, with those ridiculously over-long arms and legs. (Yeah, I know, you have to sort of really understand physics and mathematics to understand this. If you don't get it, ask a local 13-year-old, he or she will likely be able to explain it to you...
)
In any event, Maddon has stated on a lot of occasions that they will
always handle CJ very carefully, and only extremely rarely allow him to pitch on consecutive days, or to more than about 5 batters in a single game. That's because, with such little actual muscle mass on his limbs, if he damages arm or leg muscles, he's likely out for the season, if not for the rest of his career.
And you want to turn him into a starter? To do so, you would have to trade him to a team managed by someone other than Joe Maddon, because even if CJ started, I don't think he'd pitch past the second inning on any team Joe is managing. Because Joe won't risk a guy's career the way other managers around the league might.
Just sayin'...