I do not like how the L's have comported themselves in regards to GP and her parents. However, based on tehe information thus far about today's search I think the following is most likely.
Since this is literally right near where the Ls originally reported they suspected their son may go, I think previous search efforts were hampered by water. That has been a continuing theme in this case, because, Florida and all. I suspect BL has been dead a while and that his parents were not offering continuing aid to him while missing. I am torn as to whether they assisted in him making his escape, but I do not believe they've been in contact with him since the day he disappeared himself.
I think now that the park was reopened and the Ls knew they could finally go and search themselves, they contacted LE and let them know that was their plan. Probably in part to give them a heads up since press is following their every move and there could be issues around that that LE should be aware of beforehand.
They get there, they begin searching the area they couldn't search as well due to flooding prior, and low and behold, just as they indicated when BL first went missing, there is evidence the BL was there and there are partial human remains.
The only thing I am still on the fence about is did he meet with an accident or did he take his own life?