There is no question that many players have had great success with CTE. Are they all smarter than an attorney? I think one's general intelligence has little to do with it. Everyone has the capacity to learn CTE.
For a comparison, how do you attain a clean consistent stroke? Do you read a book? Take professional instruction? Both of these will help accelerate the process, but there is absolutely no substitution for practice and persistance until the stroke feels natural. It can take months to years.
You can apply the same analogy to CTE. It is very different than traditional aiming methods. At first it will seem awkward. But through practice and persistence, it will come.
This has been my experience with CTE. I consider myself a pretty smart guy. I was a double major computer science and math, and minor in music. I do application development for a career, and I played lead trumpet in a jazz ensemble at the college level. So did I watch the DVD and "get it"? Absolutely not. It was confusing and full of unanswered questions. However the underlying principle really intrigued me, and I decided to pursue it. So on pretty much blind faith, I took the DVD to the table, watched a shot, then stopped the video and attempted the shot myself. Although the procedure was quite alien to me, I was able to pocket balls pretty quickly. So I just kept going. Slowly but surely things started to feel more natural, and ball pocketing became easier. At about the eight month mark, things really fell into place and this is when I started feeling comfortable with the system. Every day I get a little further. Can it be learned faster? I'm sure it can, and it all hinges on the amount of time you have to practice. I only had a day a week.
As things came together, many things said and demonstrated on the video began to fill in the blanks. I would watch the video again and again, slowly assembling the system and making it work. I can't tell you how many emails were sent to Stan, but he answered all of them, usually within the same day.
So IMHO whether you are a rocket scientist or a GED has little to do with any of it. It is willingness to learn and persistence that will bring it all together.