I know they haven't released COD, but I have a feeling that if the ME came back with cause of death being drowning (accidental only) they would have announced the COD and closed the case as an accidental drowning. Someone is involved in this, even if they'd drowned no one would drive their bodies 20 miles away to dump them under the cover of thick brush.
They'd have a much better chance of it being ruled a drowning if they just let them be, right there in the lake.
I agree that they are jumping the gun on building the gazebo, as God forbid someone in the family is involved, people may not be so happy about memorializing such a crime.
Either way, anything the community does to recognize the girls deaths I think is a great tribute, as these girls should be remembered. I do however, wish they would wait until the crime is solved, as something as nice as a gazebo and park renovation would be a great way for the community to come together as well as find closure together.