The bike could be a ruse to draw off resources... to what end? I'm still pondering this.
I'm trying to put my self in the perp's shoes. A girl on a bike is missing. I'm leaving Lafayette with a girl and a bike. In some ways, a girl is more easily concealed in a truck than a bike, if unconscious. And maybe the bike is in the back, and a red flag. Separate girl from bike, and now you have a girl, but not the red-alert girl/bike combo.
Think about pulling over to dump bike at night as I head toward Baton Rouge. There is very little traffic.... but I'm afraid that with my luck, the moment I pull to the shoulder on the Basin Bridge, someone comes up behind and sees something. So I remember Whiskey Bay, and how desolate it is. Then I start down the deserted exit. but then I get paranoid that there might be someone down there to see. And there's no other exit for quite awhile. I rush to a decision and stop on the exit ramp - jump out, toss the bike over the side, cringing at whatever noise it may make, then drive through the boat ramp area, freaking out and looking around, then get on the on-ramp and get the hell out/.// with Mickey still with me.