"might" be: uncomfortable with women but has had relationships
I believe Unsub to suffer from limerence in his romantic relationships with women, and that he's had several extremely heartbreaking romantic relationships with women over the course of his life most likely beginning during adolescence, and possibly experienced being "cheated on" by them during one, some or all of these romantic relationships.
Although never mentioned, may have taken something from each victim
I feel that he absolutely took a personal item of sentimental value from each of his victims. I believe he had successfully related to them in a more personal way than just a client relationship.
The burlap has a meaning to him and also defines his organizational pattern
Burlap was referred to as sackcloth in the Bible and represents mourning. I believe that Unsub was brought up in a strict Christian household, but also may have dabbled in the occult.
He likely watched the coverage
I think he is a narcissist and most definitely watched the coverage.
Has strong ties to the area and knows it well.
I feel that Unsub lives or used to live somewhere near Ocean Parkway, on the South Shore of Long Island, and within a 30 minute drive of Amber Lynn Costello's former residence in North Babylon.
His personality can switch quickly
I think that Unsub suffers not only from limerence but also explosive rage disorder, and that his uncontrollable rage is triggered when he loses patience.
Would not quit unless dead, in jail, moved (in which case still killing as some suspect), or got too old.
I agree and believe Unsub could still be killing, most probably killed more than just the GB4 and Asian male, has changed his dumping ground and adapted his modus operandi.
In my research of the case, and thinking about it for several years now my ideas about it have evolved over time. I believe Unsub is responsible for the murders of the GB4 and Unidentified Asian male, but not Shannan Gilbert and the other victims found along Ocean Parkway.
My train of thought about the killer is as follows:
On the surface Unsub appears to be a "john" who is disgruntled with women and derives some sort of pleasure from killing them, but I think that his motivation is different than just that.
Prostitutes provide an easy way for him to approach and engage with them intimately, and there is very little risk, or no risk at all, of him being rejected. He seems to be seeking "damsels in distress" possibly believing, in his mind, that he is will be able to relate to them and help save them from a troubled life. I believe that Unsub has a history of drug abuse which helps him to relate to them and them to him, especially in the case of Amber Lynn Costello. I feel that in the case of Melissa Barthelemy, the calls to her younger sister were his way of trying to scare her away from the lifestyle that her older sister was engaged in.
Unsub's past heartbreaking relationships, and him feeling "cheated on" is significant. He says to Melissa Barthelemy's younger sister, "Do you know what your sister is doing? She's a *advertiser censored*!" The word "*advertiser censored*" is connected to prostitution, and has also been used by men to refer to women who pursued unfaithful desires. The idea of a woman being a "*advertiser censored*" is revolting to Unsub, because not only does it denote the betrayal he felt in his past romantic relationships, it also conflicts with his strict Christian upbringing.
When he finally connects with a potential victim he is willing to pay them for the time they spend with him, and is able to successfully convince them that he is trying to help them change their life for the better. He develops a more personal relationship with them and they begin to trust him. From the potential victim's standpoint, as long as they are earning money, they have no problem spending time with and listening to him. He may seem harmless to them, and this may be the reason that Megan Waterman and Amber Lyn Costello felt safe enough to go with him absent their cell phone and without the protection of their own driver.
At some point during the relationship with the potential victim Unsub loses patience and his explosive rage is triggered, and in this state of uncontrollable rage he strangles them to death.
After he kills them he seems to dispose of their bodies in a ritualistic way, carefully wrapping them in burlap and placing them almost evenly apart, and in an area by the water that is familiar to him, almost like his own personal graveyard. He even returns to the area to visit them afterwards, as he states in his phone call to Melissa Barthelemy's younger sister, "I'm watching your sister rot.". The ritualism is what makes me believe he dabbles in the occult, and that he took something personal and sentimental from them for safekeeping. In the case of Maureen Brainard-Barnes he also left something significant of his with her, which was the belt with the initials inscribed.