If Drew had not reported AJ as missing, keeping his body in the home, how many years might have passed before anyone realized he was gone! It sounds like no one at the contractual law job Drew had knew about the kids or his personal life, JC had cut off contact with family. Would anyone noticed?
Also, since Drew did make the call, did he reach the point where he is tired of all the nonsense, deciding to give up? JC had pretty much moved on, at least emotionally, it appears. Did Drew fess up in retaliation?