Again, we have no way of knowing what all tips were called in, and everything that people reported that they saw. What I do know, is that it would be a huge mistake for LE to not consider something because it may not match entirely with what we THINK are other pieces of the puzzle. Maybe there was an ice cream truck heard near the Collins home. Maybe the girls met someone at the ice cream truck that enticed them away to another area, such as the lake.
So I sent the tip in, and hypothetically of course, LE contacts Peppys (I'm sure they have already done this prior to my tip), the Peppys employee maybe saw them, OR saw someone lurking, or parked, or whatever. Or maybe they noticed something on a different day that they now think could be suspicious.
I'm not saying that the ice cream truck was involved, and I cant say how and why the bikes ended up on the trail. I'm just saying consider the possibilities. It could lead down an entirely different path that leads to the killer.
Police have placed the cycling children right next to Meyers Lake between 12:30-1:00, so it seems like the children cycled to the lake where their bikes were found.