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No, it doesn't prove your point at all. Speaking is a a productive function of language. Comprehension is a receptive function. And just being able to comprehend what is spoken on a receptive level is not indcative of superior intelligence. A parrot is able to mimic English. Does that mean they have intelligence equal to humans?
Example: Someone who understands the sentence, "It is time for you to sit down." via spoken language.
Someone who understands the principles of Quantum physics, and can engage in a lengthy and detailed discussion of such via ASL.
All a parrot can do is mimic. Not actually comprehend. Sorry but thats a poor example. But even on the subject of animals.... higher IQ in animals shows better understanding of humans. The only reason why they don't speak "human" is because of a lack of vocal chords. However, I digress..
Speaking babble is a manipulation of vocal cords. Speaking ideas, words, sentences requires not ONLY the innate ability to form language as you said, but ALSO being able to use and remember your speech therapy training, and keeping up with it. What does a deaf child need in order to gain the most out of speech therapy? I KNOW personally some deaf children do not succeed at all with speech thereapy. Why?