Here is an article with a lot more information on Joseph Brewer, his family, some more back ground. I think it is suspicious that the article says he moved out of the house a few months ago, but then that a neighbor saw him at the house on Tuesday. Did he get nervous when he heard the bodies were discovered and come back to make sure he cleaned up well enough.
http://www.nypost.com/p/news/local/..._icUSVNRrW8naxbU8gaK5AJ?CMP=OTC-rss&FEEDNAME=
Also the vehicle pictured is a Jeep Cherokee, I believe that vehicle has a sun roof, so it wouldn't be the vehicle seen parked very close to the dump site.
This article also describes Cruz as Waterman's pimp, rather than her boyfriend, as other articles had called him. He may have been both, but it seems more important to know that he was her pimp. Also her mother seems to think he knows what happened to her.