If a local perp dropped the bike that early, it likely was as a distraction, and maybe she's closer to home.
If the perp was on the way to Baton Rouge or NOLA, then it was done in transit, and maybe it was not intended to be found, and was, anyway. But I ask.... why take the time to do this, in transit, when you've got a kidnapped woman in your car? You're increasing your risk just by driving down there - especially if a cop happens to cruise by to check the area and you've got her in your car. I don't think Mickey was with the perps when they dropped the bike.
So either they kept her in Lafayette and took the bike out there to draw attention away from Lafayette, or they took her to NOLA or Baton Rouge and wanted to distract. There are lots of places around those places to dump a bikes w/o drawing predators, etc. By picking WB, it was a known serial-killer dumping spot, and the perp probably knew the search would be intense there.
It gave the perp some time to do what he wanted to do, while LE was distracted.
This all makes me discount a panicked departure from Lafayette, and stopping to dump the bike. It would make more sense, since having Mickey is already a bust, to take the bike with you.
I don't see the bike being put there in a panic. it was planned.
I still think local perp(s)... but have no sense of where they may have taken her