How smart does one have to be to drop a body off the side of a road, or in a wooded area or a body of water? Anyone could do that. Obviously he is not smart, if he is guilty and has made this many mistakes in covering up and dealing with police.
But I worry that his reactions to her family pointing at him may keep his mouth shut. It may be a vey long time before he confesses as to where she can be found, if ever. If he did this, he is presenting himself as the injured party and won't want to go back on that. If he ever confesses, it may be a long way down the line, either if Christina is found by someone else, or right before a trial for murder without a body. Jmo
If EA is the culprit I'm thinking the same thing. (Not saying he is innocent, but the odds don't look too good for that right now.)