All searches after Oct 6th were because of leads or new information LE had learned. LE knew about the wine run on Oct 10th, but they didn't take Jersey into custody until Oct 15th. I believe that they still thought he was their suspect until they brought him in. It's very obvious that whatever they learned from Jersey that they cleared him as a suspect, because a mere 2 days later they took a cadaver dog into the Lister home. Another 2 days after that, they executed the SW. During the 17 hour search they did luminol testing, probably took swabs, we know they took fibers and x-rays. All that took some time to process and go over the files. We also know during this time is when they wanted to re-interview the boys. They then searched the pond on Oct 27th. It's clear that whatever LE learned from Jersey, the search with the cadaver dog and the search on the 19th when the executed the SW, had them re-evaluating that timeline because they then went and searched the pond behind Festival Foods.
That's why we have that time between the discovery of the wine run and the search of the pond.