That possibility has been brought up before so I’ve considered it. I think it’s possible but not probable. That would add to his risk to leave the store, go into the parking lot, move a car, and then reenter. All that with 6 people taped up by the back door plus someone could have came into the store while he was gone.
The police would know where she parked and they asked about those two cars specifically. If she hadn’t came forward by March 18 then one of those two vehicles could have been her. We don’t know when she came forward though (as far as I know). The first mention of her is July 18, 2008 that I can find. The way the article is worded makes it seem like police have known about her for awhile.
True, but desperation would have forced his hand. I don't think his car was that far from the entrance (compared to where he initially parked), but far enough to make it difficult to drag a duct-taped hostage. Was the SUV of interest "backed-in" to the spot, do we know?