Maybe I missed this...did JW drive to the S family's home once he learned of the fire?
Recent Wapo article suggests that he did: http://www.washingtonpost.com/local...185622-0a11-11e5-95fd-d580f1c5d44e_story.html
"Wallace then drove to Virginia to work on one of his boss’s projects, a martial arts studio. The fire was discovered about 1:15 p.m., and police say Wallace was in Chantilly at the time. He learned about the fire from someone at American Iron Works, and he texted Amy and Savvas Savopoulos several times as he drove to their home."