Well, that's a belief you have which might turn out to be right. But it might not.
Let's just say that when a guy is drafted at the end of the first round and plays behind two great or very good players in his position, it's ok if it takes him 4 years to break out (Ant), but a guy that was drafted closer to the top-end of the draft, seems to be more NBA ready body wise and will likely have much less great competition ahead of him in the SF position, might be productive earlier than that. Of course, I have no idea if he is or not, but I was pretty sure Ant would be something since the very first summer league game I saw him play.