Although Rugen admitted that he initially suspected DB, he concluded with the theory that Jersey took Lisa Irwin. In particular, Rugen proposed that Jersey may have taken Lisa as some weird way to have a baby with Megan Wright. Rugen also suggested that the 2-week prior break-up of Jersey and MW, may have been an issue. This bizarre idea (to provide Lisa to MW) may have fallen apart when he couldn't contact her by phone.
I just wanted to say that I agree that this general theory (namely that Jersey is involved) sounds on the right track. Sadly, the radio program didn't discuss the dumpster fire and Jersey's prior arson conviction even though this is the best reason to suspect Jersey (not just because he was MW's boyfriend). Together though, the fire, the call to MW's phone, and the similarity of the sightings and surveillance video to Jersey make him a very strong suspect.
Obvious we need to find Lisa. I think that is best done by taking the sightings (including Mike Thompson's at 48th St. and N. Randolph Ave. at around 4 am) very seriously and by performing searches based on the idea that Jersey had been carrying Lisa for about 3 miles at that point. Jersey's arms and legs were tired, and he couldn't have gone too much further by foot, maybe a couple more miles. If he got over to the cemetery or off in the woods, there woud have been no one there to seem them, especially in this 4-6 am time frame. I think this is why there weren't any more sightings after Mike Thompson's and why Jersey seems to have hidden Lisa so well from us.