How can you know that verbal articulation is a weak correlate? There must be some other, canonical way to measure intelligence?
Consider thought that all mammals have imagination, and model-based reinformcement, and a wide vareity of other capacities required for intelligence. And so merely issuing "text" captures, incorrelate, only these capacities by proxy.
I'm sure if you thought about it yhou could come up with tests that distinguish lizards from birds and the greater apes from the lesser. Those are the tests