The difference between my post #41 example and Courtois example is the time between the touches and 'release'. In my example we can easily say the keeper released the ball. In the Courtois case if it was a release or not is not very clear at all and debatable.
As mentioned in the other thread you can only be penalised for touching the ball again after releasing it. One can assumes if you no longer have control, then you must have released it. This assertion doesn't go well with the lotg definition of control. With the lotg definition if a goalkeeper deliberately and successfully rolls the ball toward himself with his hand to pick it up (example I used in the other thread), he has no control of the ball between the two touches and therefore he must have released it so its an offence. However this is clearly not the intent of the law and no one would even think that the keeper ever released the ball.
So the problem with the current law is its definition of control is ambiguous and there is no definition of release. So in the Courtois incident, it all comes down to the referee's interpretation of 'release' and a decision can be justified either way.
In my example post #41, if you consider the keeper kept control of the ball from the moment he touched it the first time (did not release it) until he picked it up, you then have to penalise him for the 6 second clause. That is why the time between the two touches is a factor too.