While I’m not super-sold on the idea that the victims were kept for some time before being killed and left along the parkway, Dave Schaller made a comment on the LISK podcast that gives some credence to that theory.
In his interview, Schaller said he identified Amber Costello by a tattoo on her arm. Amber disappeared on September 10th and was discovered 3 months later in December. If she was placed along Ocean Parkway within days of her disappearance, she would have been exposed to myriad weather and elemental conditions that would have accelerated her decomposition before December. Late summer/early fall is still warm, hot, humid and moist with extended sunlight and at least average rainfall. Fall transitioning into winter brings shorter days, colder temperatures, and rainfall and/or snow. Lastly, winter has snow, rain, ground moisture depending on precipitation type and levels, and barren trees and shrubs that would offer little to no protection from the elements and direct sunlight to a body left on the roadside. In consideration of these things, was Amber placed along the parkway just days or perhaps a week prior to being found, thus low to no decomposition and a still visible tattoo?