Greta appears (on air) to have developed a friendship with Moe. What if she talked to him at length off the air and some things came out and she suggested he call the police and tell the entire story?
Excellent theory. Definitely a possibility.
I wonder if Moe began feeling that the fix was in. He and his wife have been criticized pretty heavily while Stern is hiding out pimping funerals in the Bahamas. Maybe he realized that it would be him and Taz doing the perp walk if he didn't come clean.