Long time lurker (mostly LISK) however, I grew up and live in the vicinity of all of this and have been following it obsessively. I felt compelled to register to make this post as a thought came to mind. I've read roughly 90% of this entire thread and have not seen it mentioned before.
Has anyone looked into underground marijuana grow operations? I think this would tie a lot together.
With the size of their dig, it appears they may be extracting something much larger than bodies. I also remember seeing early on mention of people seeing a bunker-like object and also different objects being pulled up out of the hole. would explain why the family has this nice property up in Solebury and chooses to live in Bensalem. Also may speak to why the confession came so quickly after the "family attorney" got involved w Cosmo. My thought is more people involved in the grow operation but were not involved w the killings and needed immediate seperation of the two. Also would tie together the one source who claimed Cosmo wanted to "talk business" and recruit him as a dealer.
Also Cosmo indicated he felt cheated in seperate deals, which led to killing. Many people (myself included) doubt the motivation to kill over purported small amounts of weed that Cosmo was dealing. Also doubt a farm this out of the way would be a spot for them to make a small drug deal. Obviously, Cosmo was not adverse to conducting these deals in wawa parking lots. Perhaps this wasn't the case, my thought is maybe certain people either through buying from or dealing for Cosmo, knew of the grow op and were either skimming from the supply seperately or collaboratively which would make more sense as a motive than seperate, small deals/debts.
This of course is all MOO and the result of me piecing together everything Ive read here over the past few days. I believe it should comply with all forum rules. If not, I apologize.