Don't say what's on your mind Scott lol....IMO he anchored the body just like he said in hopes the body would float to the surface and he would collect the life insurance...and those trips out to the bay ? he was looking to see if the body was floating.
Oh, yeah--those trips to the Bay, I was just thinking about those.
I think the consensus is that he was repeatedly going out there b/c he was anxious that something might float up, um, a little too soon, and he wanted to know the bad news immediately.
It occurred to me that maybe that's also the answer to why he continued to call Amber even after their conversations turned into her raising her voice to him and demanding information. I think he wanted to keep in close touch so that he would know immediately if she was going to do anything detrimental to him.