The only theory regarding this man's uncommon appearance that I have been able to find was brought to my attention by C.H.R.G. member Rebecca Hargett. She states that "from his appearance and movement, my diagnosis is microcephaly, but that would have to be confirmed to be certain. Just to rule out any doubt." Indeed, photos of microcephaliacs do bear a striking head and facial resemblance to this fellow and no one had any objections to this possibility. Another member stated "it could be both" suggesting that perhaps this man does suffer from microcephaly and is also a Yeren hybrid as his mother reportedly says. Most agreed that something about the subject in the video is very compelling and even eerie. His movements were described by member Simon Hicks as "ape like". Simon also points out an "animalistic nervousness" about the man.
Microcephaly (my-kroh-SEF-uh-lee) is a rare neurological condition in which an infant's head is significantly smaller than the heads of other children of the same age and sex. Sometimes detected at birth, microcephaly usually is the result of the brain developing abnormally in the womb or not growing as it should after birth.
As we can see, this man's head does appear to be disproportionate to his body. The only thing about this individual that does not seem to match up with typical cases of microcephaly is his overall size and physical prowess. Delayed speech is a possibility as I see no evidence of him speaking words throughout the video. Consider the following:
Signs and symptoms of microcephaly may include a smaller than normal head circumference that usually remains smaller than normal as the child grows, dwarfism or short stature, delayed motor and speech functions,
I would like to have more information on this case, but at this time I have been unable to find the original story or an official report. Until then it remains a mystery.