I think I agree with you about early talkers. My oldest son David didn’t talk at all until he was about 15 months old and then he talked in sentences. Seems that he had been practicing when no one was around. However, once he started, he never shut up .

Ian, however, ALWAYS talked….it just became clearer. Even when it sounded like babbling, it was obvious that he was trying to say something. He even made jokes. He would be sitting in his car seat making incomprehensible sounds while I drove. But if I turned to look at him, he would break out in laughter, like he had just said the funniest thing in the world and couldn’t help laughing at his own joke.