While I agree with you that most boyfriends, husbands, lovers are POIs from the get go, they are usually turned suspect or eliminated by way of evidence pointing to another source, POI. He alleges he was sleeping, per his roommate's, yet his roommate was sleeping as well. IMO, there must be more compelling evidence against JW to qualify him as a POI after a house, car, person search and polygraph. LE investigations are usually meant to narrow down the focus to the actual murderer, wrongdoer, person hiding the body, yet it seems to me that they aren't eliminating JW, even after passing a polygraph....
There must be more compelling evidence against JW to qualify him as a POI? Every name that has been mentioned publicly is a POI -- by BPD's very definition. And not one has been cleared.