I forgot the details but i think the kid is barely alive when they found them because the kids father was abusive. He lock the kids there for days.
If im not mistaken, dane found them like a day after grayson locked himself.
I still remember grayson asked the kid whether he still alive ..(〜 ̄△ ̄)〜
Grayson still did not understand what ge did wrong. He still believe the bad kid deserve to be locked

The first time i read this scene in the novel, i confirmed that this guy brain cerebrum located in different area of his head