-respectfully snipped by me-
What can they be trying at this point? It has been almost 4 months, Robyn has not been found. If she did not drown and if GG commited a crime they do not know what happened nor where it happened and GG does not talk.
That leaves whatever the FBI found on his computer. I seriously doubt that if GG planned such a crime he would leave traces of such on his computer, but if so, it has also been almost 4 months since the FBI confiscated his computer, it would be known by now I assume if anything of relevance regarding this case would have surfaced on the computer and GG being charged by now.
There are no more searches going on for quite a long time, the sniffer dogs did not gave any results, there are no witnesses of GG committing a crime, that leaves GG's troubled past with woman, the insurance policy and him not coming across as very alarmed when he went to look for help, plus the alleged dry swim short and wet shoes.
I do not doubt that ALE wants to try very hard to find answers, but what can they really do at this point, I would be curious to learn some examples of what they could do for the next 5 weeks. IMO