Seems like kind of a weird way for evolution to go. Basic motor skills--let's keep them on the outside
where they're more easily damaged!
Consider this: in every air-breathing creature on earth, the airway is not only connected to the digestive tract, but they actually *cross*! The esophagus is located *behind* the trachea...
Now, who's to say the skull isn't shaped to also protect those parts of the brain, seeing as they're located in the *base* of the lekku, rather than the tips.