True. It is pure speculation, I'll galdy give you that. I just don't see another theory that fits.... It fits the profile so to speak.....
Try this theory. The police receive a tip that there could be three individuals with a bomb headed toward Miami to blow something big up. They pull the car over. They blow up the backpack. They tell the media that their dogs were alerted to explosives. They tell the media that the license plates are stolen. They shut down major raos arteries for 16-19 hours. They call in the FBI and who knows what else. Then they start to acquire facts whic don't help their theory. The license plates are valid. There are no explosives. Staring to look like "egg on the face" time. Thats when you back off and hope things go away as quickly and and quietly as possible.