Very interesting. I still have many questions.
I've read about similar discoveries with the same conclusion.
Has there been a case as severe as this one seen in a live child? While it is a valid explanation as to why the skull is enlarged, I think it too easily resolves the mystery. Sometimes the answer is not the easiest or most "logical" (according to consensus reality/conventional wisdom).
I think this medical conclusion too easily sweeps the story under the rug, but I do acknowledge it as a possible answer to the origins of the skull. However, why was it found unburied in a cave? Were the skeletons found together? Is there actual evidence in the skull that points to hydrocephalus?