For once, we can thank the media for getting the word out on this pair. If this hadn't been publicized, they'd already be reporting to OBL.
With them being in their early 20's, the substitute driver might have just thought they were high school students. They obviously knew enough to lie to the LE and not carry ID. They also knew exactly where the bus was going to stop to pick up kids and had probably staked it out in hopes of one day getting a driver who didn't know the kids. As I said the other day, it's a darn shame but we had to have a talk with our kids about this and what to do just in case.
Astute observation. It could be just a coincidence that the driver was a substitute that day, but ...