If proximity is paramount, then it makes sense to attribute ALL of the remains found along Ocean Parkway to LISK. After all, the remains of the unidentified Asian male, Jessica Taylor, and the unidentified mother/daughter were found closer to those of Costello, Barthelemy, Brainard-Barnes and Waterman than Shannan Gilbert's were.
It seems like there are a few schools of thought when it comes to what's going on with the remains along Ocean Parkway and in Manorville.
School #1: One suspect killed Costello, Barthelemy, Brainard-Barnes and Waterman.
School #2: One suspect killed Costello, Barthelemy, Brainard-Barnes, Waterman and Gilbert.
School #3: One suspect killed Costello, Barthelemy, Brainard-Barnes, Waterman, Gilbert and some combination of other victims found along Ocean Parkway.
School #4: One suspect killed Costello, Barthelemy, Brainard-Barnes, Waterman, Gilbert, some combination of other victims found along Ocean Parkway and some combination of other victims found in Manorville.
Does that strike you as being about right?