Nancy Grace said if someone is at Brooks Island, no one at the boat launch could see anything going on at the island.
This would have given SP plenty of time to get the body into the water and not capsize the boat.
One other thing, I do think he got his clothes soaked along the line, b/c the first thing he did when he got home was to wash his clothing. Those that know, say SP has never done laundry, ever.
I think he got the clothes somewhat wet....but he washed them because he had concrete brushmarks all over them from handling the dumped anchors. I'll bet you he also used plastic hooks in the anchors to avoid metal detection.