:floorlaugh:
Secretly fix the plumbing
You make a very solid case. I must add, I found something of interest (which I didn't see prior):
http://crosscountryadventures.wordpress.com/2011/08/23/why-i-chose-to-talk-about-steve-powell/
If you notice; she is saying that her previous comments of "you don't know what goes on in that house" pertain to Steven's behavior alone. If this is true, then that was the mystery information.
Another tidbit; scrolling down you can make your own assumptions from someone who supposedly knows Susan. If Josh did feel/say that, well- that could be motive- jealousy.
Steven probably rubbed lies into his face until he cracked. Mysogynistic Steven cuckholding Josh (Steve was placing all the blame on her regarding flirtations, etc.).
His dopey demeanor is somewhat deceiving. If you want a good depiction of Josh google "Hans Klopek". I'm wondering if the entire house is that of the Burbs.