What if the pilot attempted a ditching? As I recall, when Sully landed in the river, there was little debris other than the rafts and life jackets. If the plane was ditched, and for some reason the passengers were unable to get out before it sank, would that explain the lack of debris?
Doesn't seem to fit the no radio situation.
Think of the Gol 737 flight after collision. Pilots were probably under too high of G load to operated anything other than the yoke or pedals if that. Aero forces broke the tail off, but it was still in large intact pieces until ground impact.
It's still a large search area, so lack of debris reports less than 2 days after search started I think is not unexpected. It's hard to be patient after something like this.